Feature 1STABLE CONNECTION: Our extension rod is applicable to all 1/4 in screwdriver bits and has a magnetic locking design to ensure that your screwdriver bit will not move anywhere! The ergonomic black outer sleeve can rotate freely for maximum stability. 2QUICK RELEASE: The quick release system allows you to install, lock and unlock the batch head easily and quickly. If you want to eject the drill bit, just push the sleeve down and replace it. 3WIDE COMPATIBILITY: This 1/4in hex shank rod is compatible with electric drills, screwdrivers, and other hand tools. 4300MM, 150MM: The 300mm rod and 150mm rod enable the screwdriver to get the places where are hard to arrive, expanding the working distances. 5FINE WORKMANSHIP: The rods and bits are well crafted with smoothly and fine appearance, with standard size, well match with your equipment!SpecificationItem Type: Screwdriver Bit Extension Set Material: Aluminim Alloy, Alloy Steel Hex Socket Diameter: 1/4in (6.35mm)1/4in Hex Shank Opposite Side: Approx. 6.35mm / 0.25inExtension Rod 300mm: Approx. 310 x 15 x 15mm / 12.2 x 0.59 x 0.59in Extension Rod 150mm: Approx. 160 x 15 x 15mm / 6.3 x 0.59 x 0.59in PH2 Bit: Approx. 25 x 6.35 x 6.35mm / 0.98 x 0.25 x 0.25in .wang-edit-text{ font-family:'Arial' !important; } .wang-edit-text table { border-top: 1px solid #000; border-left: 1px solid #000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid #000; border-right: 1px solid #000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }Package List2 x Extension2 x PH2 Screwdriver Bit