Drill America 60 Piece m42 Cobalt Screw Machine (Stub) Drill Bit Set (Wire Sizes: #1 – #60), D/ASTCO 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. 60 piece drill bit set comes in a metal case. Drill America 60 piece 135 degrees split point heavy duty drill bit set comes in a metal case. Manufactured to National Aerospace Standard 907, these drills are self-centering and reduces thrust. Ideal for portable or machine drilling. Short, rugged construction performs well in a broad range of materials in the iron and steel families. Screw machine drills are popular in the automotive and construction industries. They are often used in screw machine set-ups where spindle clearance is limited. Sizes smaller than #52 have the 118 degrees standard point. Set include #1 to #60 wire gauge sizes. Any product you return must be in the same condition you received it and in the original packaging. Please keep the receipt. We usually respond within 24 hours on weekdays. Thank you for shopping at our store.