WOOD DRILL KIT - It comes with 8 pieces of wood countersink drill bit, a hexagonal wrench and a 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, cannot fit hard things like steel, iron, stone. p> USES- Wood countersinks are used for drilling on wooden floor or other hardwood, suitable for table drill, impact drill, for drilling machines with chuck and more. p> QUICK CHIP DISCHARGE - The spiral wood bits have the chip flutes and five-edged chamfering machine, can quickly discharge sawdust to achieve a smooth surface on any type of hardwood. ADJUSTABLE LENGTH - The wood countersink kit comes with a hexagon sleeve which is adjustable, to adjust the various length screws by loosening and tightening the screw. can also be used for quickly disassembling accessories.