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The NEIKO 10218A 5 Piece Heavy Duty Industrial Grade Countersink Drill Bit Tool Set is perfect for woodworking and carpentry professionals, machinists, and do-it-yourselfers alike! Each countersink bit, or sometimes known as countersinker bit, is designed to cut quickly and easily in soft metals such as stainless steel, wood, rubber, plastic and other machinable metals. Give your screws a stronger joint into its holes by creating the sink holes that this drill bit set can create. With an 82-degree tip and a five-flute design, create holes for flush fastening to keep your projects fastened securely.