Hex shank quick-release bit extension by XINGWEIQIANG. Mini screwdriver bit extension available in lengths from 2.36 in to 5.91 in, with a 0.25 in screw-head size (6.35 mm). Made from chrome‑vanadium steel, magnetic and non-slip, explosion-proof design, sold in packs of up to five. Supplied without a handle. Customization available.