Adjustable depth stopper and countersink length The drill countersink includes an adjustable depth stopper to control the countersink depth and prevent throughpenetration. The countersink length can be adjusted to match different screw lengths, improving work efficiency. Chip evacuation and cleanliness Spiral wood flutes evacuate chips quickly from the hole, helping to keep the work area clean and reducing dirt residue buildup in the cavity. Multipurpose use for soft materials Ideal for home or professional woodworking projects. It is suitable for drilling countersink holes in soft materials such as wood, aluminum, plywood, plastic, and PVC boards. Not recommended for metal or sheet steel. Material and durability The predrill with countersunk head is made of quality alloy, delivering cutting performance, durability, and good wear resistance. Applications and use scenarios Furniture assembly: countersinking screws in soft woods or plywood for flush, clean finishes. Cabinetry and trim work: creating consistent countersink holes in soft materials for precise hardware mounting. Plastic or PVC projects: countersinking screws into soft plastic or PVC boards for secure, flush fittings. Usage guidance Set the depth stopper to the desired countersink depth, adjust the countersink length to the screw length, then drill as needed.