5Pcs 4.2mm High Speed Steel Twist Drill Bit with Hex Shank 95mm Length 36mm X 38mm Mainly for HVAC air-conditioning devices

Mainly for HVAC air-conditioning devices

Voltage insulation: 1000V

24 x Bearing Washers

waterproof and rust-resistant

Total Size : 65mm x 22mm x 60mm /2

5Pcs 4.2mm High Speed Steel Twist Drill Bit with Hex Shank 95mm Length 36mm X 38mm Mainly for HVAC air-conditioning devicesDescription: 1. Made of high speed steel with dual coating of gold titanium and black nitride for better lubrication, smoother drilling. Increase the hardness of the drill, with good wear resistance and durability. 2. Can drill with less force and good radial stability. Easier chip evacuation, better heat dissipation and increased drill durability. 3. Suitable for drilling holes in alloy steel, wood, nonferrous metal, cast iron and hard plastics. 4.