1、[POWER TOOL PARTS] Including 3pcs 1/4in hex shank drill extension rods and a quick drill chuck, often installed on power tools to use. 2、[MAGNETIC SOCKET] The holes at the bottom of these drill extension tools are magnetic, with locking mechanism for safe operation. 3、[DRILL QUICK CHUCK] The drill bit quick chuck can easily convert the cordless electric screwdriver into a drill bit, improving work efficiency. 4、[EXCELLENT MATERIAL] The extension rod tool is made of chrome vanadium steel, heat treated to increase the hardness and wear resistance. 5、[CLAMPING RANGE] The clamping range of the quick chuck is 0.3‑6mm, which is suitable for more clamping projects. 3 x Hex Shank Extension Rod1 x Quick Drill Chuck Item Type: Drill Bit Extension SetMaterial: Chrome vanadium steelPurpose: Drill accessoriesHex Shank Specification: 1/4inQuick Chuck Clamping Range: Approx. 0.3- 3.6mm / 0.01- 0.14inQuick Chuck Surface Treatment: Nickel plating