AmmoGarand's M1 Garand Gas Cylinder Lock Screw Wrench with dual heads for use with Cross Slot Poppet Valve Gas Screws and Single Slot National Match / early WWII Gas Screws. We've redesigned this tool to be a much sturdier and longer wrench than other versions and more functional than the single sided bronze wrenches. Custom made in the USA by AmmoGarand, these wrenches are less than 8 ounces with a length of 4-1/2 inches long by 5/8 inches wide and knurled for better grip and torque. Screw heads are beveled for quick engagement. Wrenches are Zinc plated for corrosion resistance and have an improved stronger combo head. *Note: Tool is NOT intended or made to free welded or rusted gas screws or to torque single slots screws as this will damage or break the heads.