AccusizeTools - M35 HSS+5% Cobalt Premium 115 Pcs Drill Set, Industrial grade, 135 Deg Split Point, 3-in-1, 1/16-1/2'' + #1 to 60 + A to Z, Fully Ground, 0422-1003; Cobalt drill bit set With aggressive 135 degree tips, these cobalt drills bits not only last longer while drilling but also cut faster than standard high speed steel bits. It&#039;s ideal for drilling cast iron, heat-treated steel, stainless steel and other hard materials. Premium Quality, Brand New Solid M35 = H.S.S + 5% Cobalt 115 PC / Set: 1/16 - 1/2&#039;&#039; By 64ths , No.1 to 60 and A to Z Straight Shank Fully Ground in Strong metal box 135 split point for fast penetration and accurate starting with no punch. Retains hardness at high temperatures. Lasts 12x longer than standard 118 point drill bits Packed in a strong metal case