Wheel-a-Weigh Extra Duty Pivoting Transom Wheels are ideal for larger inflatable, aluminum or fiberglass small craft.This model carries loads up to 330 pounds. The wheel frames lock into the up or down position. In most cases, the craft can be operated in the wheels-up position, or the wheels can be quickly and easily removed by releasing the stainless steel detent pin that attaches the wheel frame to the pivot bracket. Complete, detailed and easy-to-follow instructions are included along with all mounting hardware. All Wheel-a-Weigh components are made of stainless steel, except for the precision molded wheel hubs and rubber tires.This model features:Curved Wheel Frames:These pivot under the transom in the down position, distributing loads forward and providing better balance. This eases transportation on sand or hard surfaces.Roller Needle Bearings:Located between the hub and axel, these bearings provide smoother wheel rotation under load.