Snap-Loc E-Track Dolly – Extreme, 1,600 lb Capacity features 6” solid synthetic stealth cushioned swivel casters with a push bar for smooth movement on hard surfaces, dirt, gravel, grass, and sensitive flooring, with brakes for control. Built-in E-Track anchors on all four sides allow cargo to be secured with E-Track straps (sold separately). Made in the USA from heavy-duty HDPE with a steel frame, this 3-in-1 modular system converts to a dolly and panel cart and interconnects for larger loads.