We are official distributors of Drill America. HSS, Jobber Length, Set, 115 pc Set, Size and Description Fractions, Letters, Wire, Package Qty 1. Drill America Qualtech 115 piece 135 degrees split point heavy duty drill bit set comes in a metal case. National Aerospace standard 907. Made of heat-resistant cobalt, they display higher red hardness which permits speeds up to 30 percent greater than High-Speed Steel drills and. Especially effective in drilling tough, high tensile strength materials like PH stainless steel. These drills are self-centering and reduce thrust. Sizes smaller than 1/16-inches have the 118 degrees standard point. 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 tool holding systems. In a counterclockwise direction (right-hand cut) spiral fluted tools evacuate chips up and out of the cut to reduce clogging. Set includes #1 to #60 wire gauge sizes.