ITEM NAME:10PCS 4mm Micro HSS Twist Drilling Auger bit for Electrical Drill New A#S Product Description Description: 100% Brand new and high quality Straight shank design is more suitable for many electric drills and drilling machines Sharp and twisted drill will make the drilling be more easy and effortless High Speed Steel (HSS) made, stable performance and durable Suitable for wood, aluminum, plastic, etc. Product Name: Twist Drill Bit Design: Straight Shank Material: HSS Diameter: 4mm Total Length:Â Â 75mm Included: 10 x Twist Drill Bits.High Speed Steel (HSS) made, stable performance and durable. Material: HSS. Straight shank design is more suitable for many electric drills and drilling machines. Sharp and twisted drill will make the drilling be more easy and effortless.