Mounts on any length 3/4" black pipe with both ends threaded (pipe not furnished).Clamping capacity only limited by length of pipe used.Multiple-Disc-Clutch design which allows a secure hold at any point along the pipe.Clamping faces are approximately 1-3/4" square.Pony Tools Inc. makes all PONY Clamp Fixtures with U.S. and foreign parts in our Chicago factory.