The Paddleboy Scupper Pup fits into the scupper holes of almost any size sit-on-top kayak. This cart is designed to carry 200 pounds, and disassembles without tools for compact storage. The Paddleboy Scupper Pup comes with two sizes of crossbars in order to accommodate almost any size sit-on-top kayak. Scupper holes of the sit-on-top must be at least 3/4" diameter. The tomato-red wheels simply release with a tug of a cotter pin. A great addition to your paddling gear!