The Close Quarters Tool crimps rings to ASTM F-1087 on 3/8", 1/2", 3/4", and 1" pipe. A wrench is used to torque the bolts down until the gap is eliminated. Convenient 1" and 3/4" on one side, flip over and 1/2" and 3/8" on the reverse. Complete with a gauge to assure crimps are to specifications.