The ColumPRO 15PCS Countersink Drill Bit Set is your complete woodworking solution for precise drilling, countersinking, and plug cutting. This set includes 5 tapered drill bits (#4, #6, #8, #10, #12), 2 replacement bits for #4 and #6, 2 wood plug cutters (3/8", 1/2"), 2 depth stop collars, 2 Phillips screwdriver bits (PH1, PH2), 1 bit extension shaft, and 1 Allen key. Crafted from high-speed steel with a nitrided surface, these bits offer enhanced durability, rust resistance, and cutting precision. The adjustable depth collars allow for consistent pilot hole depth, while the 82° countersink angle ensures a flush, professional screw fit. Ideal for cabinetry, joinery, and DIY woodworking projects, this countersink drill bit set is equipped with a 1/4" hex shank for fast and secure bit changes. Whether you're a professional or hobbyist, ColumPRO delivers accuracy, speed, and convenience in every wood project.