Steel; 2.250 in. Largest od; 2.250 in. H; bore diameter thd internal; 3.500-16un-2b; rh; 1.000 in. Lg of thds; 4 attaching arm on body; 90 degrees apart; 2.250 in. Lg; each arm has unthd mtg hole 0.250 in. Dia; each arm when parallel w/bore will pivot 90 degrees angle to bore; extended lg of each arm is 2.375 in.