B-Line B160ZN Eaton series strut fittings and accessories, 3.18" Height, 2.5" Length, 1.62" Width, .56lbs, Steel, Two hole closed angle, 52-1/2 deg, Thickness 7/32 in, 9/16 in hole diameter, Electro-plated

Holes are 9/16 inch diameter, which is the standard strut hole size for 1/2 inch hardware. You supply the strut nuts, bolts and washers separately; the fitting itself is just the steel angle with two holes.

Electro-plated zinc is a dry indoor finish. It handles normal interior humidity in mechanical rooms, ceiling spaces and electrical rooms, but for exterior runs, wash-down areas or corrosive environments you want hot-dip galvanized or stainless versions of the same angle instead. Plated steel will surface rust once it sees standing water or salt.

Steel at 7/32 inch thickness. That is the heavier gauge B-Line uses on its structural strut fittings, not a light sheet bracket, so it is intended for load-carrying strut connections rather than trim work.

Order it as B160ZN. That is the Eaton B-Line catalog number and the manufacturer part number; the ZN suffix denotes the electro-plated zinc finish, which is how B-Line distinguishes it from the galvanized and stainless variants of the same angle.

That is what a closed angle at 52-1/2 degrees is for. It lets a diagonal strut kicker land on a vertical or horizontal run without cutting the strut on an angle, so it is common on seismic bracing and trapeze support for conduit and cable tray. Two holes, 9/16 inch, one bolt per leg into a strut nut. Structural load ratings for your specific brace should come from the engineer of record for the bracing design.