1/3PCS Magnetic Bit Holder Extension 60mm 100mm 150mm 1/4 Inch Hex Shank Quick Release Screwdriver Bit Holder Extension Bar Description Power saving parts for electric hand drill, made of CR-V (chromium vanadium steel). Hexagonal shank has a diagonal diameter of 1/4 inch (6.35mm). Hexagon with strong magnetism. Features: The interface has locking mechanism, built-in strong magnetic. Suitable for electric drill, driver, air batch conversion, extend all kinds of batch head, driver head conversion use. Fast and tight Solid. Greatly improve work efficiency. Specifications: Material: 40CR V Packaging: 1/3PCS Size: 60mm 100mm 150mm Special reminder: This extension bar can only be loaded with a single head of the lot Mouth, can't hold a double-headed mouth!! _x000D_ _x000D_ _x000D_