HSS-Co Drill Bit Set for High Tensile Steels such as Stainless Steel Alloyed with 5% Cobalt to improve heat resistance which perform and outlast normal HSS bits particularly if your work involves drilling tough metals Handheld and Stationary Use (In Drill ) 135 Degree Split Point Tip 74 pieces drill bits with different size in one super value set Type:Auger 100% New&High Quality Colour:Gold Material:HSS-Co 5% M35 Cobalt Size: 1MMx10pcs,1.5MMx10pcs,2MMx10pcs 2.5MMx10pcs,3MMx5pcs,3.2MMx5 pcs 3.5MMx5pcs,4MMx5pcs,5MMx5pcs 6MMx5pcs,7MMx2pcs, 8MMx2pcs Package Contents: 74 * Drill Bits Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.