General description The CSPARKV 5pcs Countersink Drill Bit Set is designed for woodworking and drilling holes in various materials such as wood, plastic, and more. This set includes five specially designed steel countersinks and one punch, making it ideal for DIY projects. Technical specifications Material: YG8 alloy countersink drill bit, 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 Shipping quantity: 6 pieces Usage Perfect for drilling in wood, fiberboard, particleboard, plywood, plastic, PVC, rubber, etc. External thread helps evacuate waste during drilling for successful results. Precise punching can be completed quickly and accurately. Other information Use the hex key to adjust the depth of the countersink and the drilling depth for screws of different lengths.