Steel, back flange 0.750 in.H, 4.250 in. L, 0.188 in thk w 2 holes 0.281 in dia, 0.750 in w, 0.188 thk, 3.125 lg support arm at right angle to flange with 2.375 u shaped end to support steering column, w 2 thd places 5/16-18 unc-2a thds 1.188 in depth at u ends