Manufacturer part #: 11511 This dolly style is custom-sized for catamarans of all kinds, from 13' Hobie Wave to the 19' Prindle Tough, UV-protected, injection-molded ,through-bolted, plastic joint components. 1 1/2" square structural-grade, anodized aluminum with boat-friendly round corners. Delrin ball bearings in wheel hub result in easy rolling on rough surfaces or deep sand. Strong, 3" non-stretch, polyester sling. CatamaranÕs hulls rest on two cross tubes covered with vinyl rubrails outside the wheels Eyelet on sling handle fitting helps prevent slippage on ramps Dolly breakdown using the snap buttons on tongue tube Pneumatic, non-corrosive, 16" x 4" wheels can be secured on wheel shaft with provided screws for added security. For soft sand conditions, tire pressure can be reduced to increase tire footprint. Proudly made in the USA. Call us for technical support, customer service and product information (877) 240-VELA (8352)