High Speed Steel Twist Drill Bit, 4.1mm Fully Ground Black Oxide 73mm Long 10Pcs Plunger Latches Nominal Shaft Diameter (dr): 12mm

Nominal Shaft Diameter (dr): 12mm

Plug Inner Hole Dia : 4mm

extreme axial electric fan ventilation with heat

Bearing Washer Model: AS75100

Chemically resistant

High Speed Steel Twist Drill Bit, 4.1mm Fully Ground Black Oxide 73mm Long 10Pcs Plunger Latches Nominal Shaft Diameter (dr): 12mmDescription: 1. Made of high speed steel, with great toughness and hardness, not easy to break, easy chip removal, the drill quenching treatment, improve the hardness of use. Surface black oxide treatment, not easy to rust. 2. This twist drill is proper for electric drill, hand electric drill and impact electric drill. Suitable for Stainless steel, iron, copper, aluminum alloys, wood, plastic drilling and carving. 3. Spiral flute design for quick