DWD115J-CO-SET 115 Piece M35 Cobalt Drill Bit Set (1/16″-1/2″, A-Z, #1-#60), DWDCO Series. Cobalt steel tools are similar to high-speed steel, but with more cobalt for improved performance when cutting harder metals such as stainless steel or nickel alloys. Gold oxide is a thinner oxide surface treatment than black oxide typically used to identify cobalt steel tools; performance is similar to uncoated tools. Round shanks allow use with a wide variety of toolholding systems. When run in a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging. 115 piece drill bit set comes in a metal case. Drill America Qualtech 115 piece 135 degrees split point heavy duty drill bit set comes in a metal case. Manufactured to National Aerospace standard 907. Made of heat resistant cobalt, they display higher red hardness which permits speeds upto 30 percent greater than High-Speed Steel drills and are especially effective in drilling tough, high tensile strength materials like PH stainless steel, inconel, and titanium. These drills are self-centering and reduces thrust. Sizes smaller than 1/16-inches have the 118 degrees standard point. Set includes combination of fraction, letter, and wire sizes: 1/16″ to 1/2″ (1/64 Increments); A to Z; # 1 to # 60. 15.63 x 6.3 x 3.98 inches; 2.2 Pounds. 1/16″ – 1/2″ A-Z #1-#60. 6.3 inches x 15.63 inches x 3.98 inches. Weight: 2.2 lb. We can cancel the order for any reason and at any time. Make sure you provide a correct address because it will no longer be possible to change it later. You have 30 days to return at your expense. If there were delays they could be caused by couriers and not by us. Thank you for choosing us!