INDUSTRIAL-GRADE STEEL - The groove wheel pulley is made of solid 304 stainless steel, which has high hardness, good strength, and a smooth surface. The pulleys bearing is thickened to make it more sturdy and durable. It is highly resistant to rust, corrosion, and abrasion.POEWERFUL & WORK SMOOTHLY - The V-groove track wheel has a powerful loading bearing capacity, which is up to 440 lbs. The thickened bracket and the external nut have reinforced the wheel making sure it is not easy to fall apart. The friction between the wheel and the bearing is very small, so it can run smoothly without getting stuck or making harsh noises.PRODUCT SPECIFICATIONS - A package includes 2 pieces of our V-type groove wheels, which are 2.2 inches in height and 1.8 inches in diameter. With a depth of 0.31 inches, each groove has an external width of 0.86 inches and an internal width of 0.62 inches. When you secure these wheels, please note that the mounting hole is 0.27 inches in diameter.WIDELY-USED - The V-groove wheel pulley is reliable and practical, which can be installed on container shelves, yard gates, rolling shutters, sliding doors, industrial carts, racks, assembly fixtures, etc. It is widely used in factories, transportation sectors, construction sites, and more.