The Proto B943920 is a tether-ready, 12-point 3/8-inch drive socket sized for 1/2-inch fasteners, measuring 1-1/8 inches in length. The 12-point configuration makes it ideal for use on stubborn or damaged fasteners, as well as fasteners made from soft materials, providing reliable engagement in demanding conditions.
Featuring Proto's TorquePlus™ drive technology, this socket engages the flats of the fastener rather than the corners, distributing contact stress over a larger surface area. The radius-corner design minimizes fastener rounding and slippage, delivering high-performance torque transfer and protecting fastener integrity during tough jobs.