High Speed Steel Shank Twist Drill Bit 1/2 Handle Twist Drill Bit 135° Outside Edge Angle Shank Drill Bit for Wood Copper Plastic (22mm).

Specification: Item Type: Drill Bit Material: High-speed steel Chip Flute Length: Approx. 5 mm/0.2 in Blade Length: Approx. 15 mm/0.59 in Outside Edge Angle: 135° Series: 1/2" Handle Twist Drill Bit Application: Suitable for drilling various materials such as die steel, I-beam, channel steel, plain steel, angle iron, aluminum, copper, wood, and stainless steel from 1 to 3 mm thick.

Instructions for Use: 1. If the material being drilled is too hard, first use a 3-6 mm drill bit to make small holes, then use a larger drill bit to enlarge the holes. 2. The rotation speed of the electric drill for drilling hard materials should be between 80 and 120 RPM for best results. 3. Because stainless steel contains more alloying components, its hardness and mechanical properties are higher. When drilling with a hand drill, you need to apply sufficient pressure and the motor must be powerful enough. It is easier to use a bench drill. 4. Add coolant or cutting fluid to cool the hole when conditions permit, reducing damage to the drill bit from high temperatures and extending its life. Packing list: 1 x drill bit