Iron casting, nodular class 5 or 6 specification mil-i-11466 irregular u shape, 2 c to c base mounting holes, 0.162 in dia.2 mounting holes on each arm 2.765 in diameter located 13.750 in.From center of base mounting hole to top of arm, 14.703 in. H, 2.310 in.Wide, 3.500 in.Opening