57.00 in. Lg, contains 3 supports, first located 6.62 in. Second26.62 in. Third 46.62 in. From left end, 1 bracket on bottom located10.81 in. From end, 1 strut assembly, two 0.158 in. Min, 0.164 in. Max diaholes in line tap no. 10-32 nf-2 thd first hole located 19.25 in. Fromend second hole located 24.563 in. From first hole 1.81 in.From topof beam