1Made of high quality steel, high hardness, better wear resistance. 2The product is heat treated and has a longer service life. 3Exquisite workmanship, each edge can lock screws accurately , no damage to the screw. 4The use of the most advanced technology, the design of waist which can enhance the durability of the screwdriver bits. 5108pcs screwdriver bits with various models, can meet different using needs. Features: 1. Made of high quality steel, high hardness, better wear resistance. 2. The product is heat treated and has a longer service life. 3. Exquisite workmanship, each edge can lock screws accurately , no damage to the screw. 4. The use of the most advanced technology, the design of waist which can enhance the durability of the screwdriver bits. 5. 108pcs screwdriver bits with various models, can meet different using needs. Specification: Condition: 100% Brand New Item Type: Screwdriver Bit Material: CR-V Chrome Vanadium Steel Specifications: 1/4 inch 6.35MM hex handle Model: PZ1 / PZ2 / PZ3 / H4 / H5 / H6 / TX10 / TX15 / TX20 / TX25 / TX30 / TX40 / PH1 / PH2 / PH3 / SL4,5 / SL6 / SL7 Quantity: 108PCS Package List: 108 * Screwdriver Bit Have a great time shopping!