Also know as the Yakima Werner foot brace system, common on white water and sea kayaks. Might be used for some Boreal kayaks. Made of aluminum with two boltholes, 10 inches on center. Rails are 10 5/8 in. overall length. 12 adjustment settings, slotted bottom. Tapped for 1/4-20 Screws. Left and right are the same. Sold in Pairs. Mohawk Canoe