Genuine Unistrut P2072A-EG 1-5/8" Diagonal Mount Post Base Strut Mount for All 1-5/8" Single Strut Channel Genuine UNISTRUT Brand 1-5/8" Single Channel, Angled Mount Post Base For use with: P1000, P1100, P2000, & P3000 and All 1-5/8" Single Strut Channels For use with: 1/2" Bolt in All 1-5/8" Series Strut Channels Silver Finish: Electro-Galvanized Zinc; ASTM B633, Type III