Feature: 1. Better Stability and Balance: The 200mm long drill bit provides better stability and balance during fast operation, ensuring that the position is intact, allowing you to reach hard to reach areas 2. Of Sharpness Twisted Drill Bit: The classic HSS structure is heat treated, and the of sharpness twisted drill bit makes drilling easier, durable and not easy to bend 3. 4mm-10mm Round Shank: 4/4.2/4.5/5/5.2/6/8/10mm standard round shank rotary drill bit, easier and safer to install on all electric tools, convenient to use 4. Faster and Cooler Drilling Process: Pointed nib and twisting design increase the cutting speed, help remove debris, reduce friction and heat, and make the drilling process faster and cooler 5. For Most Soft Material: The drill bit set is suitable for most soft material drilling operations, such as aluminum, wood, plastic, PVC or stainless steel (1-4mm) Specification: Item Type: Twist Drill Bits Material: High speed steel Purpose: Twist drill bit set Color: Silver Shank Shape: Round Twist Drill Bit Length: Approx. 200mm / 7.9in Twist Drill Bit Diameter: Approx. 4mm / 0.16in 4.2mm / 0.17in 4.5mm / 0.18in 5mm / 0.2in 5.2mm / 0.2in 6mm / 0.24in 8mm / 0.31in 10mm / 0.39in. Package List: 8 x Twist Drill Bits Note: When using twist drills to drill holes, please wear protective gear to prevent the debris from splashing and hurting yourself.