PRECISION COUNTERSINK DRILL BIT SET Includes three countersink bits, all #6 (9/64 tapered drill bit), designed for up to 3/8 (10mm) screw heads. The set also includes one extra tapered High-Speed Steel M2 (6542 grade) drill bit, a stop collar, and a hex wrench for precise adjustments. ADJUSTABLE COUNTERSINK DEPTH The adjustable stop collar ensures consistent counterbore depth, while the adjustable cutters accommodate various screw sizes, providing clean, flush finishes on all woodworking projects. UNIVERSAL QUICK-CHANGE SHANK The 1/4 hex shank allows for fast and secure bit swaps, making it compatible with all 1/4 quick-change chucks, ensuring smooth workflow efficiency. DURABLE, HIGH-QUALITY MATERIALS Designed to meet JNB Pro s strict quality standards, featuring High-Speed Steel M2 (6542 grade) drill bits for sharp and fast drilling. The Carbon Steel #45 countersink cutters are coated with Black Oxide for enhanced corrosion resistance and long-lasting performance. IDEAL FOR PROFESSIONALS & DIY WOODWORKERS Perfect for woodworkers, carpenters, cabinet makers, and DIY enthusiasts, this set works efficiently on hardwood, softwood, plywood, and MDF.