Tighten small bolts and nuts faster and more carefully than with a wrench. Hex to square adapter fits MAGNA-TIP handles and power driver bit holders converting them into effective nut drivers using your 1/4" drive sockets. Gives added versatility for your MAGNA-TIP set. Mfg: Brownells SPECS: Steel. 1.25" (31cm) long. 1/4" hex (6.3mm) to 1/4" square.