SELF-CENTERING 3 PIECE SET: 3 heavy-duty Countersink bits for creating chatter-free countersunk screw holes in steel, brass, aluminum, plastic, wood and other materials. DESIGNED FOR EASY USE: Uses 1/4 in. stepped shank and 5-flute rose-pattern bits. DURABLE : Constructed with high-speed steel these bits are extremely reliable - use up to 2000 RPM. INCLUDES: 1/2 in., 5/8 in. And 3/4 in. bits GENERAL TOOLS: We're a recognized leader in designing and developing specialized precision tools dedicated to delivering exceptional customer service. We encourage artisans and DIYers to work smarter, measure better, and repair more productively