Uxcell High Speed Steel Twist Drill Bit 4mm Drilling Dia. with 1/4 Inch Hex Shank 95mm Length

Uxcell High Speed Steel Twist Drill Bit 4mm Drilling Dia. with 1/4 Inch Hex Shank 95mm Length 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. Compared with the ordinary drill with a quick change hexagonal handle handle diameter 6.35mm (1/4 ) fixture is more stable more convenient to replace.