The Proto B943754 is a tether-ready, 12-point deep socket featuring the TorquePlus™ drive design that engages fastener flats — not corners — for quick, secure socket seating. The radius-corner internal geometry shifts contact stress away from fastener corners and distributes it over a larger surface area, minimizing slippage and reducing the risk of rounding damaged or soft-material fasteners.
Built on a 3/8-inch drive with a 2-3/4 inch length, this deep socket is ideal for reaching recessed fasteners in tight spaces. The tether-ready (-TT) feature supports tool tethering systems for use in elevated or safety-critical work environments where dropped tools are a hazard.