Designed for Inflatables, Aluminum and Hard Shell boats. Launch the boat by yourself-comfortably with Wheel-A-Weigh Launching Wheels. Designed to be moved into the raised position after launching or to be totally removed after launching by simply pulling the quick release pins. No tools required. Heavy duty 4" by 16" pneumatic tire and solid one-piece injection molded rim. Constructed of marine grade aluminum, anodized for long life, all stainless steel fasteners. Mounting fasteners supplied. Easy installation.