JOBBER LENGTH: 3/16-inch cutting diameter, 2-5/16-inch flute length, 3-1/2-inch overall length, 135 degree split point, 3-flat shank MADE FROM HIGH-SPEED STEEL AND 5% COBALT: improve much higher heat resistance because of cobalt steel's high red hardness, provide strong durable performance compared to typical hss drill bits CAN BE REPEATEDLY SHARPENED AS NEEDED: cobalt drill bit's hardness is uniform throughout the entire material, so that can be repeatedly sharpened without damaging the cutting edge allowing it to drill more than hss drill bits APPLICATION: best used for drilling in hard metal, including stainless steel INCLUDE: 12 pieces of 3/16-inch cobalt drill bits with case UPC 752785985217 ASIN B07FXRSPHW Model DHCO29 Set Name 12 pieces Brand Name Drill Hulk Shank Type 3-Flat Unit Count 12 Count Item Weight 1 Pounds Part Number DHCO29 Point Style Split Point Finish Types Gold Oxide Manufacturer Drill Hulk Ltd Material Type High-Speed Steel and 5% Cobalt Tool Flute Type Spiral Cutting Diameter 0.19 Inches Number of Flutes 2 Number of Pieces 12 Cutting Angle String 135 Degrees Minimum Bore Diameter 0.19 Feet Surface Recommendation Stainless Steel