[Solid quality roller steel wheel, should last a long time]: Made of high quality steel, fine workmanship, water resistant, corrosion resistance, high strength, good toughness, low creep, abrasion resistance and chemical stability, durable to use, V Groove adapts perfectly to reverse tracks and can dampen the vibration, noise-free and silky smooth. Widely used, provides greater flexibility and better use of available floor space]: A must have for electric / rolling dog / baby gates, industrial trolleys, assembly devices, containers, racks and other equipment and projects [Complete installation in minutes]: These pulleys can be bolted or welded, it just remove the wheel and installed What you get]: 2pcs V-groove wheel, and friendly customer service 2pcs 2 V-groove wheel with standV-groove wheels are for running on track or ground on reverse angle iron track in production lines , gives greater flexibility and better use of available floor space. Widely used on reverse track, rolling gate, sliding gate, industrial machinery, wire rope rail device, container carrier, baby carrier, dog carrier , etc./ Fine finish Material: Made of high quality 45 thick stainless steel with galvanized Load capacity: Easy to carry up to 660 lbs Temperature range: -45 F to +180 F Direction: Directional casters Smoother V-shaped Wheel diameter: 49 mm Slot width: 19 mm Groove depth: 10 mm Base plate size: 38 mm x 68 mm / 1.50 x 2.68 Mounting distance: 24 mm x 55 mm / 0.94 x 2.17