The Proto B328978 is a tether-ready 3/4-inch combination wrench featuring a satin finish that provides corrosion resistance and a slip-resistant grip. The 12-point box end allows for fine indexing to improve speed and access in tight spaces, and fits 4, 6, and 12-point fasteners. The box end incorporates the Proto TORQUEPLUS™ system for enhanced torque application.
The open end features Proto's Anti-Slip Design (ASD), which grips fastener flats to reduce rounding and improve control. Designed for industrial and MRO applications where tool retention and drop prevention are critical, this wrench is ready to accept a tether attachment for added workplace safety.