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17mm Channel / Unistrut Socket, 1/2" square drive. It's design enables the socket to slide through standard 41mm x 41mm unistrut. The photo is for illustration only, to show the design. This is just for one 17mm socket.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.