Mounts on any length 3/4" black pipe with both ends threaded (pipe not furnished). Comes with 4 - Multiple-Disc-Clutches made of pelted hardened steel. Clamp faces are approximately 1-3/4" square.Castings: Also available in 1/2" Malleable and/or ductile iron with baked enamel finishNote: Also available in 1/2" pipe version