Feature 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 0.33.6mm, which is suitable for more clamping projects. 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 Package List 3 x Hex Shank Extension Rod1 x Quick Drill ChuckNoteNote that only the bottom of the hole part of the extension rod tool is magnetic, and the hex shank is non magnetic, and is only suitable for single bit drills.