Precisely secure fittings, electrical panels, junction boxes, or piping clamps within channels or conduits using Discount Strut Accessories's Top-Lock spring 1/2-13 Strut Nuts. Strut nuts with springs ensure a more precise, secure fit that won't budge. Easily mount, brace, support, & connect lightweight structural loads such as pipes, electrical & data wire, ventilation, air conditioning, & other mechanical systems. The electro-galvanized coating is best for indoor, dry settings. Use with W100, W150, W200, W210, W300, W400, W500, W800 & W900. Finish: EG Size: 1/2"-13; Thickness=1/2"