Included in kit: Hardware kit - (8) 16mm M8 button head bolts (4) 16mm M8 hex head bolts (8) drop in T-nuts nuts (4) Slide in T-nuts Flat and lock washers for all (1) extra of each bolt, nut, and washer (4) aluminum brackets (2) crossbars Dimensions: Standard - 50"L x 1.25"H x 2"W XL - 57.5"L x 1.25"H x 2"W