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 RodMaterial: Chrome Vanadium SteelSpecial Design: Self locking buckle, strong magnetConnector 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