Feature: 1. Stable Connection: These bit extension rods have standard 6.35mm hex socket design, ensuring stable and reliable connection and preventing detachment and loosening during use. 2. Chromium Vanadium Steel: The extension bit holder is forged with chromium vanadium steel, which has high hardness, rust and aging resistance, no deformation, and long service life. 3. Buckle Fixing Design: These hex socket bit extension rods are designed with buckle, which can fix the drill bit in place and facilitate quick disassembly and replacement of the drill bit. 4. Applicable Tools: The bit extension rod is suitable for conversion purposes such as nut, drill bit, pneumatic driver, electric driver, pneumatic drill, manual driver, etc., has strong practicality. 5. Specifications: This kit includes 6 different lengths of bit extension rods, with 60mm, 100mm, 150mm, 200mm, 250mm, and 300mm specifications, suitable for more usage scenarios. Specification: Item Type: Bit Extension Rod Material: Chrome Vanadium Steel Special Design: Self locking buckle, strong magnet Connector Size: Approx. 1/4in (6.35mm) Specification: Approx. 60mm / 2.4in, 100mm / 3.9in, 150mm / 5.9in, 200mm / 7.9in, 250mm / 9.8in, 300mm / 11.8in . Package List: 6 x Bit Extension Rods