The PRI Armorer's wrench combines a barrel nut torque wrench and a handle in one tool. It features the same design as our standard AR-15 barrel nut torque wrench, but includes an integrated handle for enhanced usability. The wrench is engineered to interface with a 20-hole pattern barrel nut, precisely calibrated for a radius of 0.78 inches The construction consists of 3/8 inches steel and includes five steel tightening pins It is compatible with both 3/8 inches and 1/2 inches drive torque wrenches