Perfect for transporting heavy boxes and items wherever you need to go, this product convert from a 2-wheel dolly to a 4-wheel cart for more hauling options. Designed for moving heavy loads, the utility cart converts into 2 modes for better use. The 2-wheel dolly holds up to 300 pounds on the large, 8-inch wheels, and the 4-wheel cart form holds up to 400 pounds using the additional 3-inch casters. A telescoping aluminum handle adjusts into 1 of 3 positions to fit your transportation needs. Built-in stair glides help maneuver the dolly up stairs and over curbs, reaching your destination with ease. The super-strong frame is built from glass-filled nylon plastic, which weighs 30 percent less than steel without sacrificing any strength. Helping you move loads with ease, this product gives you the lifting capacity needed for easy and efficient transportation.