Rhino Rack Folding J Style Kayak Carrier Extension Piece. Look no further. Rhino-Rack has designed an extension piece that attaches to one of our current kayak and canoe carriers that will allow you to add an extra watercraft. Have 2x S512 and 2x extension pieces and if your roof rack cross bar is long enough you can have up to 4 kayaks or canoes mounted on your vehicle's roof Specifications for Rhino Rack Folding J Style Kayak Carrier Extension: Manufacturer: Rhino Rack Weight: 13.8 lb Load Capacity: 30Kg Color: Black Fabric/Material: Stainless Steel Last Chance: Yes Features of Rhino Rack Folding J Style Kayak Carrier Extension Stainless steel hardware is included. Strong and durable steel coated for protection. Product comes completely assembled and ready to fit out of the box. Universal mounting to suit all crossbar shapes is also included (with fitting kits). Note - There's also a fitting kit specially designed to fit the Rola Rack and Rola Commercial bars. Package Contents: Rhino Rack Folding J Style Kayak Carrier Extension Rhino Rack S512X: Folding J Style Kayak Carrier Extension Piece