Low-Profile Summit Roof Rack Cargo Basket Usable area measures 47.625"L x 35.75"W (Overall: 49.75"L x 38") Single piece construction - No assembly required Mounts to an existing vehicle roof rack with U-bolt style clamps Maximum 150 lb. capacity Fits round bars up to 1.25"D, square bars up to 1-5/8"W x 1-5/8"H, requires at least 39" distance between cross bars