... 1/2 to 4" material:galvanized steel one hole or two hole EMT Steel Conduit Strap with One Hole or ... Two Holes for Pipe Fittings1.trade size: 1/2", 3/4", ... ", 2-1/2", 3", 3-1/2", 4"One hole, Two holes 2.material: plated steel, yellow brassIndoor or outdoor applications ...