COMPLETE SET FOR WOODWORKING This premium countersink drill bit set includes five #6 cutters (designed for up to 3/8" or 10mm screw heads), two extra tapered High-Speed Steel M2 (6542 grade) drill bits, one adjustable stop collar, one hex wrench, and a durable storage container to keep your set organized and ready for any project. ADJUSTABLE DEPTH & PRECISION CUTTING The adjustable stop collar allows you to control the counterbore depth for perfect flush screw heads, while the adjustable cutters can be modified to fit different screw sizes. QUICK-CHANGE SHANK Featuring a universal 1/4" quick-change shank, this countersink set is compatible with all 1/4" quick-change chucks, ensuring fast and secure bit changes for maximum efficiency. DURABLE & HIGH-QUALITY MATERIALS Manufactured to JNB Pro's strict quality standards, our countersink bits feature HSS M2 (6542 grade) drill bits for superior sharpness and durability, while the #45 carbon steel cutters ensure long-lasting performance. This combination rivals or exceeds the quality of USA-made tools, offering high precision at a competitive price. MULTIPURPOSE & VERSATILE Ideal for woodworking professionals and DIY enthusiasts, this set is perfect for creating clean, professional countersinks in hardwood, softwood, plywood, MDF, particle board, and more.