IRWIN 10234 Unibit #4 Step Drill Bit 3/16-7/8" (2.2-22.2mm) | High Speed Steel with 3-Flat Shank

• Save time because you don't need to change drills for different-sized round holes in thin materials. Each drill acts as a pilot for the next size.
• Made from industrial-grade high-speed molybdenum steel heat treated for maximum durability. SpeedPoint tip penetrates faster and prevents walking.
• Ideal for drilling holes into thin materials such as stainless steel, copper, brass, aluminum, plastic and laminates.
• Non-skid tip, no need for center punches. 3-faltted hex shank prevents drill chuck slipping. Drill diameters etched in flute for easy identification.
• Backed by a full lifetime warranty.

• Select Drill & Secure Bit — Choose a variable speed drill. Insert the IRWIN Unibit #4 into the drill chuck, ensuring the 3-flat shank is securely gripped to prevent slippage. Select the desired hole size based on the etched markings on the bit.
• Position & Start Drilling — Position the bit tip on the material where the hole is needed. The SpeedPoint tip helps prevent walking, but a light starting pressure is recommended. For metals, consider using a cutting fluid or oil to prolong bit life and improve cut quality.
• Drill Through Material — Apply steady, consistent pressure. Use lower speeds for harder materials like stainless steel and higher speeds for softer materials like plastic or aluminum. Allow the bit to cut; do not force it. Back the bit out periodically to clear chips, especially in thicker materials.

Typical situations where IRWIN 10234 Unibit #4 Step Drill Bit 3/16-7/8" (2.2-22.2mm) | High Speed Steel with 3-Flat Shank helps — illustrative scenarios, not customer reviews.