Tools-free Installation&Quick Release Design. No tools are required! No PVC pipe, no pliers, no wrenches, no frustration! The Quick-Release Seat Swivel + Clamp-On Base allows you to securely attach or remove the mount by hand. Spend less time setting up, and more time enjoying your water time Versatile & Adjustable Design. Iron plate with two rows of slotted holes for swivels in most sizes. ( You need to remove the iron plate and reinstall it to fit your swivel size. )What s more, you can conveniently and periodically check the tightness of the nuts, ensuring safe and worry-free navigation every time Reinforced Hybrid Build.