HSS Material & Extra Long Twist Drill Bit: Our extra long wood drill bit set made of high speed steel for high hardness and durability; 200mm extra long blade allows you to drill deeper holes with these drill bits - HSS Twist Drill Bit professional wood Twist drill bit set with 8 extra long twist drill bits in different sizes, diameters of 2mm, 2.5mm, 3mm, 4mm, 4.5mm, 5mm, 6mm, 7mm, length: about 200mm, we offer different sizes to meet your needs. 4mm long and 4mm long wood drill bit Easy to drill: The sharp twist drill bit with tips ensures better stability and balance during fast operation while making drilling easier and more convenient to ensure that the position is intact. Professional Long Wood Drill Bit Set Multi-Material Drilling: The stainless steel cobalt drill bit kit is ideal for most drilling jobs and materials such as aluminum, wood, plastic, PVC and various other materials or daily use of the bit Note: Due to the extension and hardness of the bit, the length of the bit may be slightly different. high product performance, when strong vibration occurs, drilling products are too hard or too deep, and water or coolant is not used for cooling during the drilling process, there may be drill bit breakage. Please take appropriate protective measures when using to avoid accidents with injuries.