Stainless Steel Material: The groove wheel is made of high quality stainless steel, solid and durable to use. Detail Specifications: V Type Pulley Block. Wheel Diameter 4.8cm/1.89in, Groove Width 1.6cm/0.63in, Groove Depth 0.95cm/0.37in. Strong Load Capacity: The thickened steel plate bracket and wheel core can enhance the bearing capacity, and the load capacity of every 2inch caster wheels is up to 440lbs. Double Roll Bearings: Each groove wheel is quipped with double roll bearings, which can reduce the friction with the wheel, making it easy to push the gate. Wide Application: V groove wheel is suitable for many scenes, such as sliding door, home fitness device, wire rope traction and so on. The smooth rolling operation of the grooved wheel enables effortless gate movement, reducing friction and strain on the gate operator.