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| SKU | udk0097 |
| GTIN | 00038548102207 |
| Brand | IRWIN |
| Model Number | 10220 |
| Part Number | 10220 |
| Product Name | Unibit #20 Step-Drill Bit |
| Cutting Diameter | 20 mm (0.79 in) |
| Hole Size Range | 9/16" to 1" (14.3 mm to 25.4 mm) |
| Shank Diameter | 1/2 inch (12.7 mm) |
| Shank Type | Round with Flats |
| Number of Flutes | 2 |
| Point Style | Step Point |
| Cutting Angle | 135 degrees |
| Material | High Speed Steel (HSS) with Titanium Nitride (TiN) Coating |
| Color | Multi |
| Surface Recommendation | Brass, Copper, Stainless Steel, Steel |
| Item Weight | 0.26 lbs (0.12 kg) |
| Dimensions (L x W x H) | 6 in x 2.91 in x 1.1 in (15.24 cm x 7.62 cm x 3.18 cm) |
| Country of Origin | Not stated by manufacturer — US retail version, sourced from authorized US retailers and authorized brand partners |
This item:
IRWIN Unibit #20 Step Drill Bit 20 mm (0.79 in) | Precision Hole Starting for Metalworking
5,633
This item
IRWIN Unibit #20 Step Drill Bit 20 mm (0.79 in) | Precision Hole Starting for Metalworking
5,633
Total price:
7,870
You save 7,560 (49%) Extra3 items selected
3 items
7,870You save 7,560 (49%) Extra
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Precision Metal Hole Starting, Made Easy
IRWIN Unibit #20 step drill bit, model 10220, offers a versatile solution for metalworking in India. This bit allows you to drill multiple hole sizes, from 9/16-inch (14.3 mm) up to 1-inch (25.4 mm), with a single tool. Its 1/2-inch round shank with flats ensures a secure grip in standard drill chucks, preventing slippage during operation. The High Speed Steel construction with a Titanium Nitride coating provides enhanced hardness and wear resistance, extending the tool's lifespan even when working with tough materials like stainless steel.
The step drill design creates clean, burr-free holes, crucial for precise assembly and finishing. Its straight flutes and step point geometry are engineered for accurate starting and controlled drilling. This bit is recommended for use on brass, copper, steel, and stainless steel, making it a valuable addition to any metalworker's toolkit, from professional fabricators to DIY enthusiasts. The 20 mm cutting diameter is part of its multi-size capability, offering flexibility for various project needs.
Imported directly from authorized US retailers, this IRWIN Unibit ensures authentic quality. All customs duties and GST are included in the listed price, with delivery via ExpressBox tracked shipping across India. For precision metalworking, this step drill bit provides a reliable and efficient way to achieve accurate hole sizes without the need for multiple drill bits.
Engineered for Precision Metalworking
The IRWIN Unibit #20 step drill bit is engineered for professionals and serious DIYers who demand accuracy. Its High Speed Steel construction, enhanced with a Titanium Nitride coating, ensures superior durability and performance across various metals. The unique step design allows for precise hole creation from 9/16" up to 1" with a single bit, eliminating the need to switch between multiple drill bits. This efficiency, combined with its ability to create clean, burr-free holes, makes it indispensable for metal fabrication, plumbing, and electrical work where exact hole placement is critical. Imported directly from authorized US retailers, you receive authentic quality backed by IRWIN's reputation for tool innovation.
Ideal for Metalworkers, Not for Wood
This IRWIN Unibit #20 is specifically designed for drilling through metals like brass, copper, steel, and stainless steel. Its robust construction and cutting geometry excel in these harder materials. However, it is not optimized for wood drilling; for wood, standard twist drill bits or specialized wood bits are recommended. If you require a drill bit for soft materials or general woodworking, this step drill may not be the most efficient choice. For precise metal hole starting and enlargement, this bit is an excellent investment.
Typical situations where IRWIN Unibit #20 Step Drill Bit 20 mm (0.79 in) | Precision Hole Starting for Metalworking helps — illustrative scenarios, not customer reviews.
A metal fabricator in Delhi needs to drill precise pilot holes for sheet metal assembly.
The IRWIN Unibit #20 allows drilling multiple hole sizes from 9/16" to 1" with a single bit, ensuring accurate starting points for fasteners and reducing setup time between different hole diameters.
A plumber in Mumbai needs to enlarge existing holes in copper and steel pipes for fittings.
This step drill bit's ability to cleanly enlarge holes up to 1" makes it ideal for plumbing tasks, ensuring a smooth finish and proper fit for various pipe connectors without damaging the material.
| Usage | For creating precise starting holes and enlarging existing holes in metal sheets and profiles. |
| Recommended Use | Metalworking, fabrication, plumbing, electrical installations, sheet metal work. |
| Material Compatibility | Brass, Copper, Steel, Stainless Steel |
| Tool Compatibility | Standard drill chucks with 1/2-inch shank capacity. |
| Cost per use | 1 bit for multiple sizes: ₹5,633 per bit |
| Shelf life after opening | 12 months (standard for tools, ensure proper storage) |
| Reapplication math | N/A (Durable tool) |
| Contraindications | Not recommended for wood or plastic; may chip if used on brittle materials without proper technique. |
| Allergens / common irritants | N/A (Tool) |
| Feature | IRWIN Unibit #20 | Others |
|---|---|---|
| Material & Coating | High Speed Steel with Titanium Nitride coating for durability and wear resistance. | Varies by brand; some may offer HSS, others may have coatings like TiN or TiAlN. Quality can vary significantly. |
| Hole Size Versatility | Drills multiple sizes from 9/16" to 1" (14.3-25.4 mm) with one bit. | Typically requires multiple individual drill bits for the same range of sizes, leading to more tool changes. |
| Shank Type | 1/2-inch round shank with flats for secure chuck grip. | Commonly 1/2-inch round shank, but ensure compatibility with your specific drill chuck. |
| Precision & Finish | Engineered for clean, burr-free holes in metals. | Quality can vary; some local bits may produce rougher edges or require deburring. |
| Cost per bit | Single bit for multiple sizes: ₹5,633 per bit |
About IRWIN
IRWIN Tools is renowned for its high-performance cutting tools, including innovative drill bits and saws, designed for professional tradespeople.
Compliance & Legal
No product-specific compliance warnings identified. Standard imported-goods terms apply: customs duties & GST paid; for personal use in India; follow the manufacturer's usage instructions on the packaging.
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| Attributes | Current |  |  |  |  |  | |
|---|---|---|---|---|---|---|---|
| Spec | |||||||
| Price |
| Individual bits for each size can range from ₹300-₹800 each, depending on brand and material. |
1,379 2,209 |
858 1,542 |
1,190 1,852 |
1,897 3,051 |
2,780 4,405 |
5,805 8,540 |
| Rating | 4.88(8) | 4.70(294) | 4.50(14) | 4.50(270) | 4.40(597) | 4.50(1,514) | 4.38(8) |
| Brand Name | IRWIN | uxcell | HARFINGTON | Tnisesm | FURWEY | JIBENGAO | DIYMAG |
| Source | US Retail | US Retail | US Retail | US Retail | US Retail | US Retail | US Retail |
| Sold By | CrowCrowCrow | CrowCrowCrow | CrowCrowCrow | CrowCrowCrow | CrowCrowCrow | CrowCrowCrow | CrowCrowCrow |
