
【EXCELLENT MATERIAL】The countersink drill bit set is made of high carbon steel, which has been quenched, with high hardness, good wear resistance and durability. 【PRECISION DRILLING】The countersink drill bit set's chamfering device is five-edged, which can drill a smooth and flat counterbore at the same time during use, and the screw cap is perfectly embedded in the surface of the workpiece. 【WIDE APPLICATION】The wood twist drill reamer groove is suitable for granite, ceramic tile, glass, square, ceramic, ceramic tile, PVC, rubber, plate, hardwood or parquet, etc., suitable for bench drills, hand drills and conventional drills. 【MULTI-SIZE】The diameter The countersink drill bit set's chamfering device is 15.8mm, and one set of drill bits has 7 sizes (3mm/4mm/5mm/6mm/7mm/8mm/10mm), which can meet your demand for different sizes. 【HANDMADE ESSENTIAL】If you often do hand-made woodworking, such as making small toys, small molds, woodworking decorations, etc., the countersink drill set