General description The CSPARKV 5pcs Countersink Drill Bit Set is designed for precision and efficiency in woodworking projects. Made from high-quality materials, this set includes various sizes of countersink drill bits, making it ideal for drilling holes in wood, plastic, and other materials. Technical specifications Material: YG8 alloy countersink drill bit with a 45# carbon steel body Sizes: 2.8 x 8mm, 3.0 x 8mm, 3.2 x 8mm, 3.5 x 8mm, 4.0 x 8mm Punch size: 86mm x 8mm Usage Perfect for drilling in wood, fiberboard, particleboard, plywood, plastic, PVC, and rubber Accurate punching can be done quickly and efficiently The external thread helps evacuate waste during drilling Other information Easy to use with a hex wrench to adjust countersink and drilling depth for different screw lengths