Detailed Product Description good prices good quality DIN 338 twist drill bit size: 2., 3, 4 , 5, 6, 8 mm black oxide hss speed steel 4241 masonry drill bit size: 4, 5, 6, 8, 10 mm zinc plate titanium steel 45#wood working drill size: 4, 5, 6, 8, 10 mm black oxide titanium steel 45#