6pcs Centering Drill Bit Set HSS Lathe Dredges Bit Sharp Durable Description: Traditionally used do make a conical hole for the center of the lathe to obtain a starting point for a standard twist drill, designed to prevent the twist drill from walking. Used do workpieces requiring machining between centers or manufacturing center in components. High cutting speed and good chip removal. Do precision drilling of sprouts in metals. It can be used do processing of iron, steel, copper, aluminum and others. Each bit ma double ending and grinding at a standard 60 degree angle. Preparatory tool do maintain the exact drilling position. Rotating between the tips, both end surfaces of the workpiece receive an appropriate centering hole. Specifications: Material: stal high-speed Coating: Titanium Coating Degree: 60 Size including: 1,0 mm 1,5 mm 2,0 mm 2,5 mm 3,5 mm 5,0 mm; Total length: 33 mm, 36 mm, 40 mm, 43 mm, 49 mm, 60 mm The package includes: 6pcs/set centering drill bit HSS with dredge