Our Revolver Action Wrench completely surrounds and supports the frame with special no-mar aluminum heads to prevent twisting and gouging. Heads fit existing Brownells Action Wrench System handle or start with the complete unit shown here and then add other handgun and rifle heads as needed. Mfg: Brownells SPECS: Base/Handle Unit - Steel, blued. 12A 3/4" (31cm) long, 1" (2.5cm) diameter handle. Interchangeable Heads - Aluminum A 3/4" (19mm) square, 5-1/5" (14cm) long. Complete Wrench - Includes Base/Handle and heads for one gun model, bolts and instructions.