5 Pc Countersink Drill Bit Set, With Quick Replacement Bit, M2 Drill Bits 5 Pcs Countersink Drill Bit Set, with 1/4" Hex Shank Quick Replacement Bit Holder, Hex Wrench Features: Tips for Operation: Specifications: Package includes: Notes: Countersink Drill Bit Set: the 5 pcs woodworking counterbore hole drill bits set includes five commonly applied sizes of countersink drill bits - #4 (7/64"), #6 (9/64"), #8 (11/64"), #10 (3/16"), #12 (7/32"), a 1/4" hex shank quick replacement bit holder, and a hex wrench; These sizes are suitable for the needs of cabinet and furniture makers, as well as woodworking professionals or beginners Cutting Depth Adjustable: the counter sink drill bits involve two adjustable screws that can be moved up or down the shank of the bit to limit how far the drill penetrates into the material; The adjustable counter sleeve depth can be easily modified using the included hex wrench, ensuring a precise control over hole drill depth and enhancing the functionality and usability of countersink drill bit sets Durable HSS Material: crafted from HSS high speed steel, these tapered drill bits for wood are not easy to break and rust, providing precision and performance you can rely on, suitable for a wide range of materials, such as softwoods, soft metals, plastic, plywood, fiberboard, particleboard, other composite wood products, applied for carpentry, woodworking, metalworking, cabinetmaking, etc Included Quick Replacement Bit Holder: the 1/4 inch hex shank magnetic drill bit holder serves as a convenient accessory for quickly swapping out countersink drill bits during drilling operations, whose extended torsion zone can help absorb the high torque of impact drivers, ensuring you that your bits stay in place and never wobble while in use, good for working with hard to reach screws Important Tips: 1. Ensure that the drill and workpiece are properly aligned before drilling; 2. Choose the appropriate drill speed based on the material; 3. Cool down excessive heat buildup while drilling; 4. Regularly inspect depth settings of the counter sleeve with different materials or changing bit sizes; 5. Check drill bits for any signs of damage or wear before drilling; 6. Clean and Store the drill bits after each use