1、The twist drillare made from premium high speed steel for increased durability. 2、Bit has a straight shank, which is more convenient to operate. Milled flutes with deep cut spiral that delivers fast material removal. The flutes of the drill bit act a passageway for chip extraction from the hole and for coolant to enter the hole. 3、This finish gives a strongly adhering surface treatment that acts to retain cutting fluid and prevent chip to tool welding, reducing the formation of a built-up edge. 4、Drilling, or hole making, is the most common metalworking operation in the world. Twist drill bits are the most common type of drill bit used. Twist drill bits are commonly used to drill holes with hand operated drills, standalone drill presses, or lathes. 5、This product is designed for impact applications, for fast drilling in block, masonry and concrete, ect. Features: Straight shank design is more suitable for many electric drills and drilling machines(here is not included) Sharp and twisted flute will make the drilling be more easy and effortless Suitable for wood, aluminum, plastic, etc Specification: 100% Brand new and high quality Product Name: Twist Drill Bit Design: Straight Shank Material: HSS Diameter and total length: 3mm Twist bit, 160mm total length Package include: 1 x Twist Drill Bit