It"s not just a Dolly, it"s a Tool. Our "4 Tools-in-One" design provides you the option of adding bars turning your Dolly into a Platform Truck, Panel Cart and an Inter-Connected multiple Dolly platform helping to move anything faster and safer. The Snap-Loc Dolly crushes all competitors dollies with its many unique features: 1,500 pounds capacity with super heavy duty swivel casters allow you to move heavy loads with little effort. Caster brakes to firmly hold your load on hills. Patented 4 sided E-Strap attachment holds cargo firmly to Dolly frame adding safety and protection of cargo. Best of all, their Made in the USA.