Adjustable countersink drill bit set with secure fixed counterbore and depth control Precise depth control: The counterbore is fixed on the flat of the shank by two screws for a firm fit and can be adjusted to control the depth of the pilot hole. This allows accurate drilling and consistent countersinking for a clean screw seat. Durable material: This set uses speed steel HSS grade 6542, which is harder than 4241 HSS and 4341 HSS used in similar countersink drills. The result is better toughness, wear resistance, and longlasting cutting edges. Secure, nonloosening design: The drill bit is fixed with a pin to prevent loosening from the shank. The components are designed for wear resistance and reliable retention during use. Fast, clean countersinking: The depth adjustable tool is HSS with an 82 degree chamfer, which cuts and removes chips quickly for fast, smooth countersinking. It produces a clean and consistent tapered hole for the screw, even after multiple uses. Practical finish and fit: The tool features a black oxide finish coating and a 1/4 inch shank, which fits standard chucks and helps prevent slipping in the chuck. It is compatible with standard 1/4 inch chucks and supports quick replacement with 1/4 inch chucks as needed. Key attributes Function: Adjustable countersink and depthcontrolled pilot hole drilling for precise screw seating Compatibility: 1/4 inch shank; fits standard 1/4 inch chucks Size and material: HSS grade 6542; 82 degree chamfer Performance: Fast chip removal, clean countersinking, strong retention, wearresistant 23 practical use scenarios Cabinetry and furniture assembly: Create a flush, professional finish by drilling a pilot hole and countersinking in one tool, ensuring screws sit smoothly and evenly. Hardwood and softwood joinery: Use the depthadjustable countersink to control screw depth precisely in various wood thicknesses, reducing splitting and giving a consistent results on panels and frames. DIY projects and framing: Build picture frames, cabinetry, or shelving with reliable countersinking and repeatable depth, improving aesthetics and strength without wandering depths. This description preserves the original product's purpose, specifications, and functions while presenting clear, customerfriendly benefits and realistic use cases.