High Quality Materialrustproof and durable, the edge of the drill bit is smooth with no chatter or fluted edges. For clean and precise countersinking, chamfering or beveling of round holes in workpieces. Internal Chip EvacuationThe countersunk head drill bit eliminates chips when cutting, reduces clogging and prevents metal splatter, making cutting faster, cleaner and quieter, and the round handle can be used with a variety of systems. Higher EfficiencyThe Coated Chamfer Tool HSS has high precision and sharpness, the tip is at a 90 angle for clean and precise milling. Increase productivity and save time and energy in household and industrial operations. WIDE APPLICATIONSuitable for cutting plywood, wood, acrylic, PVC board, plastic and metal. When working with materials, the bit should be kept cool between the drill holes. (Note: It is necessary to cooperate with the bench drill operation, and the hand-held electric drill cannot be used.) Package includedOur set contains 4 HSS countersink drill bits for deburring, metalworking and non-metallic cutting. 2-5mm, 5-10mm, 10-15mm, 15-20mm