8Pcs Hss Center Drill Bits Set 60-Degree Angle Combined, 1/1.5/2/2.5/3/4/5/6Mm ?Center Drill Bits Set?Comes with 8pcs Center Drill Bits Set, they are in size 1/1.5/2/2.5/3/4/5/6mm, which can meet your different needs. Each drill has a double end and is ground with a standard 60 degree angle. ?HSS Material?Made of high quality High Speed Steel for high hardness, wear resistance, not easy to break. Straight shank design is more suitable for many electric drills and drilling machines. ?60 Degree Tip Angle?Center drill bits accurate to 60 degree for producing center holds in components or work pieces with require machining between centers. ?Accurate Positioning?This countersink bit drills an exact center hole in the material prior to turning and can also be used as a starter bit to obtain an accurate hole. Suitable for all standard centers! ?Lathe Metalworking?The center drill bit set can work with lathe machines and most electronic drills to drill holes in Mold Steel, Cast Iron, Alum, Carbon Steel, Wood, Thread Mold and other tough material, it will improve the the efficiency of drilling.