
Premium Material: The punch sets are made of YG8 alloy countersink drill bit, 45# carbon steel body, sprayed on the surface, carbon steel punch for a long service life. 5 Pieces in a Set: Specially designed steel countersink countersinks or counterbore pilot hole 2.8 x 8mm/3.0 x 8mm/3.2 x 8mm/3.5 x 8mm/4.0 x 8mm and 1 punch 86mm*8mm. Ideal for DIY: Precise punching can be done quickly and accurately. The external thread can help to Discharge waste when drilling, to ensure successful drilling, very suitable for use on multiple sizes of wood holes. Easy to use: Use the hex wrench to adjust the countersleeve depth and drilling depth for screws of different lengths. Complete specifications can meet all your requirements. Usage: Countersink drill bit set perfect for wood, fiberboard, particleboard, plywood, plastic, PVC, rubber, etc.