PRECISION COUNTERSINKING FOR WOODWORKING This 5-piece countersink drill bit set includes #4 (7/64 ), #6 (9/64 ), #8 (11/64 ), #10 (3/16 ), and #12 (7/32 ) tapered drill bits, ensuring clean and accurate holes for a variety of screw sizes. HIGH-QUALITY MATERIALS FOR LONG-LASTING PERFORMANCE The tapered drill bits are crafted from High-Speed Steel M2 (6542 grade) for superior sharpness, durability, and fast drilling. The four-flute countersink cutters are made from Carbon Steel #45 with a Black Oxide coating to resist rust and wear, providing smooth, splinter-free finishes. ADJUSTABLE DEPTH FOR PERFECT FIT The adjustable stop collar allows you to control the counterbore depth for a flush screw fit, while the adjustable cutters can be set for different screw head sizes. UNIVERSAL QUICK-CHANGE SHANK Featuring a 1/4 hex quick-change shank, this set is compatible with all 1/4" quick-change chucks, allowing for fast bit swaps and seamless workflow. MULTIPURPOSE APPLICATION Designed for hardwood, softwood, plywood, MDF, particle board, and more, making it ideal for cabinet making, furniture building, woodworking, and home improvement projects. COMPLETE SET WITH ACCESSORIES Includes 2 stop collars for controlled depth, 1 hex wrench for adjustments, and a compact storage case to keep your bits secure and organized.