1Stable Connection: These bit extension rods have standard 6.35mm hex socket design, ensuring stable and reliable connection and preventing detachment and loosening during use. 2Chromium 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. 3Buckle 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. 4Applicable 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. 5Specifications: This kit includes 6 different lengths of bit extension rods, with 60mm, 100mm, 150mm, 200mm, 250mm, and 300mm specifications, suitable for more usage scenarios. 6 x Bit Extension Rods