... .5, 8, 8.5, 9, 9.5, 10. HSS straight shank twist drill1.Material:HSS M42,M35,6542(M2),9341,4341,42412.Finish ... :Tin coated,coffee,bright,rainbow colour,Black oxide,Black flute & bright ... not only provide all kinds of twist drills,such as HSS straight shank twist drills,taper shank drill,SDS drill bits,center ...