Genuine Unistrut P1873-EG 5 Hole Flat Plate Corner Bracket Connector for All 1-5/8" Strut Channel Genuine UNISTRUT Brand 5 Hole Flat Plate Corner Bracket Fitting For use with: 1/2" Bolt in All 1-5/8" Series Strut Channels 9/16" Diameter Hole; Thickness: 1/4" (6mm) Finish: Electro-Galvanized; ASTM B633, Type III