Genuine Unistrut P1047-EG 5 Hole "U" Shaped Connector Bracket for All 1-5/8" Strut Channel TRUSTED BRAND - Genuine UNISTRUT. PRECISE FITTING - 1-5/8" U-Shaped Fitting Bracket. FOR USE WITH - 1/2" bolt in all 1-5/8" series channels. DIMENSIONS - 9/16"" diameter hole; thickness: 1/4"" (6mm). SILVER FINISH - Electro-Galvanized Zinc; ASTM B633, Type III.