Countersunk Drill Set — Carbon Steel, 1/4 inch (6.35 mm) Shaft Type: Countersunk Drill Material: Carbon steel Shaft: 1/4 inch (6.35 mm) Set consists of: 12 mm, 16 mm, 19 mm Key benefits Creates clean, accurate countersinks so flathead screws sit flush for a finished look and secure fit. Carbon steel construction provides reliable strength for repeated use in common woodworking and light fabrication tasks. 1/4 inch (6.35 mm) shaft offers broad compatibility with drill chucks, bit holders, and quick-change adapters that accept a 1/4 inch shank. Three sizes (12 mm, 16 mm, 19 mm) cover a range of screw head diameters and material thicknesses, reducing the need for multiple single-size tools. How this solves problems Eliminates protruding screw heads and uneven seating that can catch or interfere with moving parts. Minimizes tear-out and splintering around screw holes when used with appropriate drilling speed and steady pressure. Simplifies installation work by offering the common countersink diameters in one compact set. Practical applications Cabinetry and furniture assembly: create flush screw recesses for hinges, hardware, and trim. Decking and exterior woodwork: countersink screws so boards lay flat and fasteners are less exposed to wear. General repair and DIY projects: prepare pilot/countersink holes in softwoods, plywood, and many plastic materials for a tidy finished appearance. Usage notes Designed for general countersinking tasks; match drill speed and pressure to the material you are working with. The 1/4 inch (6.35 mm) shaft fits most standard chucks and holders that accept that shank diameter. This set gives you three practical countersink sizes in durable carbon steel with a 1/4 inch (6.35 mm) shank for easy installation and wide compatibility.