Product information: Material: Chrome vanadium steel for shank, stainless steel for thread, aluminum for color Shank diameter: 1/4 6.35mm Interface: 1/4 6.35mm Color: 3PC red quick release stainless steel post (60, 100, 150mm) Features: Quickly install and disassemble the batch head, the colored part can be adjusted telescopically, and is used to install the double-head batch. The head has a strong magnetic coil, which can absorb screws and facilitate installation. Accepts any 1/4 bit. For hard to reach screws and nuts. Hex shank chucks firmly into drills. Also useful in hand-held drivers. Magnetized ends holds bits securely. Universal 1/4" quick-change hex shank fits all power drills, 1/4" impact drivers and handheld drivers. Extension holders in 3 different sizes so you can get superior access to hard to reach screws, nuts, and fasteners. Packing list: 3PC red quick release stainless steel post (60, 100, 150mm)