●【Countersink Bits for Wood】EZARC Wood countersink drill bit set features a comprehensive range of sizes for woodworking projects: #4 (7/64"), #6 (9/64"), #8 (11/64"), #10 (3/16"), #12 (7/32"), along with 2pc wood plug cutters (3/8" and 1/2"), a Allen Key, and 2pc depth stop collars (3/8" and 1/2"). ●【Industrial-Grade Material】Constructed from industrial-grade high-speed steel with a nitrided surface, our woodworking countersink drill bits offer enhanced toughness and wear resistance. The Cr-V alloy steel chamfering edges boast 2x longer life than common carbon steel edges on the market. ●【Adjustable Depth Control】This counter sinker drill bit set features adjustable depth stop collars, enabling precise control over pilot hole depth, ensuring consistent and precise countersinking for a professional finish. ●【Efficient Drilling & Flawless Finish】The four ultra-sharp cutters and 82-degree counterbore chamfer angle provide smooth, rapid drilling in both hard and soft wood. Tapered pilot drill bits ensure fast, clean pilot holes and a snug fit for screws. Drill, countersink, and counterbore in a single step to maximize work efficiency. ●【Versatile & Compatible】Ideal for various woodworking projects such as cabinetry and furniture making, the EZARC countersink bits are suitable for hand drills, bench drills, electric drills. Note: For optimal cutting results, it is recommended to use the wood plug cutter on a bench drill.