Four piece drill bit set for deburring, chamfering and beveling - Countersink Drill: Designed for use with a drill press. It can wobble when used in a hand drill or with a deburring tool bit, which may affect the chamfer quality. Benefits include clean,flush countersinks for fasteners and a professional edge finish on metal or plastic. - Deburring Tool Bit: Used to chamfer round openings or conical holes and for chamfering tools. Helps remove burrs and create smooth entry edges on drilled holes and related features. - Deburring Bit: Titanium-coated material with high hardness, rust resistance and robust construction. A durable deburring tool bit for reliable edge finishing and material removal where durability matters. - Beveling Tool: Ideal for beveling edges on plastics, aluminum, copper, stainless steel, aluminum plates, insulation boards and PVC boards. Also serves as a deburring tool for edge preparation and finishing. Use scenarios - Create precise countersinks on metal or plastic workpieces using a drill press for flush screw heads and clean edge presentation. - After drilling holes, use the deburring bits to remove burrs and chamfer round openings or conical holes for smooth fit and reduced risk of injury. - Bevel and finish edges on sheet materials such as aluminum plates, PVC or insulation boards, while also performing deburring to achieve a clean, ready-to-assemble edge.