Countersink Drill Bit Set: The combination tap deburring drill bit set includes 4 woodworking reamers in 4 different sizes (#6/10/13/16) and 1 hex wrench. With numbers on the drill bits for easy recognition, you can meet your different needs. Quality Material: The combination tap deburring drill bit set is made of HSS 4241, the center chamfer drill body is made of carbon steel, with high hardness, good abrasion resistance, durable, can serve for a long time. Fast Chip Removal: The CNC grinding teeth, better centered, can quickly and accurately drill a smooth hole, the wide chip slot and chamfering which can discharge the wood faster in use. Easy to Use: Use the hex wrench to remove the chamfers and adjust the countersink depth or drilling depth for screws of different lengths, then drill the screw holes and keep the same axis, after screwing the nut under the board! Wide Applications: Apply to the drill with a clamp or joint. The woodworking countersink counter drill bit is widely used for plastic, PVC, rubber, particle board, hardwood or wooden flooring, etc. Quantity Delivered: 5 pieces Product Color: Black Product Specifications: Specifications: 6# 3mm 10# 3.5mm 13# 4mm 16# 4.5mmluckymeet