Prepunched hole size: for 1/4" bolt or rod; Thickness: 7/32" Inner size: 1-5/8" x 7/16", Fit with steel channel width: 1-5/8" Ideal for Lighting, Small Conduits, DIY & Low Load Supports Low carbon steel, electro-galvanized Package list: 10 pcs 1/4" u shape washer Specification Inner size: 41x11mm,Fit with steel channel width: 41mm (1-5/8 inches) Prepunched hole size(1pcs): φ8mm(for 1/4 in bolt/rod) Material: Low carbon steel,Surface treatment: electro-galvanized Thickness: 5.6mm Product size: 56x50x17mm Package size: 11.5x8.5x6cm(10 package) Weight: 145g(net weight) 1465g(10 package) Package list: 10 pcs 1/4" u shape washer