Detailed Product Description HSS twist drill bits,roll forged with black oxided.DIN338 standard,118/135 degree more suitfor DIY market.it`s easy to drill holes in steel such as Ardal,wood,plasticTypeSizemanfacturtingMaterialPoint anglestandardSurfaceHSS drill1-131/16-1/2fully ground,roll forge,edge groundM35,M2,W9,4341,4241118/135 split pointDIN338,340,1897black oxide,bright,taitinum,amber