COUNTERTOP CUTTERS: Steel taper drill bits are used for drilling holes in wood or other hardwood floors and are suitable for bench drill bits, impact drill bits, chuck drill bits, etc. It is a must-have item for daily woodworking. STURDY AND DURABLE: Our wood drill bits are made of HSS steel with high hardness, good wear resistance and high heat resistance. The drill bit is ideal for drilling holes in wood, plastic, rubber, PVC and other materials. It is not a power tool and cannot be used for hard objects such as steel, iron and stone. ADJUSTABLE LENGTH: The HSS taper drill bit kit includes an adjustable hex socket that can be adjusted by loosening and tightening the screws with a hex wrench. It can also be used to quickly remove accessories. QUICK VENTILATION OF CHIPS: The hexagonal countersink countersink drill bits features a chip flute and a three-sided beveling machine that quickly discharges wood chips to achieve a smooth surface on any type of hardwood. DIFFERENT KINDS OF DRILL BITS: We have four sizes of woodworking drill bit with countersink, 6 , 10 , 13 , 16 . The 6 model is for drill size 2.35mm, the 10 model is for 2.5mm, the 13 model is for 2.9mm, the 16 model is for 4mm and is equipped with a wrench 5.5*2cm hexagonal. It's enough for your daily needs