WOOD DRILL BIT KIT - It comes with 8 wood drill bits, a hex key, and a storage box. The helical wood drill bits are 3mm (2 pcs), 4mm, 5mm, 6mm, 7mm, 8mm, and 10mm, enough to meet your various needs. DURABLE & ROBUST - Our wood drill bits are made of HSS steel, offering high hardness, good wear resistance, and high heat resistance. Perfect for drilling in wood, plastic, rubber, PVC, and other materials. Not a power tool; not suitable for hard materials like steel, iron, or stone. USE: These wood router bits are used for drilling into wood flooring or other hardwoods. Suitable for bench drills, impact drills, drill presses with chucks, and more. FAST CHIP REMOVAL: The helical wood drill bits have chip flutes and a five-edged chamfering cutter, allowing for rapid sawdust removal to achieve a smooth surface on any type of hardwood. ADJUSTABLE LENGTH: The wood router bit set comes with an adjustable hex sleeve. Adjust the length by loosening and tightening the screw. This sleeve can also