MATERIALS: Sliding gate wheels are made of high quality galvanized steel, sturdy, durable, corrosion resistant and waterproof for long time use SIZE: The groove wheel diameter is 50mm, the wheel inner width is 20mm, the outer width is 27mm, the groove depth is 10mm. Fits 90 degree V-track (Please confirm V-track size before ordering) LOAD CAPACITY: The thickness of the support is 3 mm, which allows a capacity of 300 kg per caster for an easy-to-transport door ROLLER CARRYING: The double roller bearings slide stably and smoothly, making pushing the door effortless PERFECT FOR: Entrance gate, factory gate, sliding fence, dog gate, garage door, garden gate, driveway gate, reverse track, industrial machine track project Delivered quantity: 2 pieces Welcometomeet