M35 5% Cobalt Drill Bits Set 115PCS (1/16″-1/2″, A-Z, 1-60), Straight Shank Jobber Drill Bits, Metal HSS Twist Drill Bits for Stainless Steel Hard Metal and Cast Iron. 5% COBALT TWIST DRILL BITS SETMade from M35 Cobalt Steel with Molybdenum and Cobalt added to form a hardened alloy, can measure up to 67 Rockwell hardness, cut faster, last longer, and last longer than normal HSS drill bits 12 times. 115PCS SAE DIRLL BITS SETThe set includes 29pcs Fractional Size:1/16 to 1/2 in 1/64th increments; 26pcs Letter Size: A To Z; 60pcs Numbered Size: #1 To #60. Comes in metal indexed storage case for easy storage. TWIST DESIGN AND PERFORMANCEPrecise 135 SPLIT Point, Gold Oxide Surface and Round Straight Shank. Prevents walking and removes chips and particles faster. Precision fully ground to ensure smooth chip movement. PROFESSIONAL AND WIDELY USEDM35 Cobalt High Speed Steel is more suitable for hardening materials. Ideal for cutting stainless steel, steel and cast iron as well as wood, aluminum alloys and other metals. Not suitable for glass or ceramic materials. Pay attention to speed, pressure and heat control when drilling. SERVICEIf you have any problem with our metric drill bit set or are not satisfied with the product, please feel free to contact WildBossy. Material: Stainless Steel, Cobalt Steel, Cobalt. Cutting Angle String: 135 Degrees. Product Dimensions? 14 x 5 x 2.8 inches; 7.05 Pounds. Date First Available? April 19, 2023. Best Sellers Rank: #26,534 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #74 in Jobber Drill Bits. #74 in Jobber Drill Bits. Customer Reviews: 4.4 4.4 out of 5 stars 197 ratings. Except on weekend or public holidays. We stand behind our products. Your receive the wrong item.