WOOD DRILL BIT KIT - Comes with 8 piece wood countersink drill bits, hex key and storage box. The twist wood bits are 3mm(2pcs), 4mm, 5mm, 6mm, 7mm, 8mm, 10mm, enough to meet your varieties of needs. DURABLE & STURDY- Our wood drill bit is made of HSS steel, high hardness, good wear resistance, high heat resistance. Perfect for drilling in wood, plastic, rubber, PVC and other materials, not a power tool, can't fit hard things like steel, iron, stone. USES- Woodworking router bits are used for drilling on wooden floor or other hard woods, suitable for bench drill, hammer drill, for drilling machines with chuck and more. QUICK CHIP DISCHARGE- The wood twist drill bits have the chip flutes and five-edge beveling machine, can discharge sawdust fast to get a smooth surface on any kind of hard wood. ADJUSTABLE LENGTH - The woodworking router bit kit accompanied with a hexagon sleeve which is adjustable, to adjust the various length screws by loosening and tightening the screw. can also be used for quick dismantling of accessories.