Our Skate Crates are made from foam filled recycled Polypropylene, with a load rating of 600kg, making them extremely robust and heavy duty whilst being exceptionally lightweight compared to any steel dollies on the market. The key is in the castors of our Skates. They have zinc plated fasteners with nyloc nuts, giving them a proven longevity even under consistent heavy work load. The Skates come standard with two back brakes to secure when stopped on an incline, and prevent spinning.