General description This 8Pcs Drill Bit Extension Set includes a vast assortment of 8 bit driver extension holders and 8 bits, providing a comprehensive solution for various drilling and driving tasks. With four different sizes (12 inch/300 mm, 2.5 inch/65 mm, 4 inch/100 mm, and 6 inch/150 mm), this set offers versatility and convenience for both daily use and replacement needs. Technical specifications Material: Steel Sizes: 12 inch/300 mm, 2.5 inch/65 mm, 4 inch/100 mm, 6 inch/150 mm (2 pieces for each size) Hex shank: 1/4 inch Compatibility and accessories Compatible with electric screwdrivers, drills, and hand screwdrivers Suitable for various screw driving tasks including drywall, patio construction, chipboard, plywood, wooden frames, and construction boxes Usage Ideal for home improvement and DIY activities Magnetized bottom hole ensures screwdriver bits stay steady and firmly fixed on screws Other information Color: Red Measurement allowed error: +/- 1-3 cm Note: Light