·【Upgraded 12 Piece Set】The AKSC 12-piece countersink bit set covers all tool accessories required for the entire woodworking project. The countersink set includes 10 tapered drill bits 2pcs #4 (7/64"),2pcs #6 (9/64"), 2pcs #8 (11/64"), 2pcs #10 (3/16"), 2pcs #12 (7/32"), 1 hex wrench, 1 extension bit shaft, and 1 storage box.

·【M42 Cobalt High-Speed Steel】This countersink drill bit set for wood is made of high-quality M42 cobalt high-speed HSS, which has 20% higher wear resistance and toughness than standard high-speed steel. The wood countersink bit maintains cutting performance at high temperatures and its service life is twice that of ordinary drill bits.

·【Unique Dual-Edged Cutting Design】These drill bits with countersink adopt a double-edged cutting design, ensuring smooth and precise surface performance. Compared to single-blade bits, tapered drill bits for wood offer faster cutting, ideal for larger or deeper countersinks.

·【Efficient and Clean Drilling】These drill bits with countersink are designed with dual-edge sharp blades and an 82 degree countersunk angle, providing quick and clean guide holes for tight screw fit on both cork and hardwood. A extension bit shaft that can be combined with tapered drill bits for wood in various ways to handle different types of screws.

·【Versatile Application】These counter sink drill bit set are equipped with a 1/4 inch hex shank and are compatible with various tools, including impact drills, hand drills, bench drills, and electric drills. This screw countersink bit set is suitable for various woodworking projects, such as cabinet and furniture making. Note: It is not recommended to use it for a long time on hardwood.