Features STABLE AND LOW RESISTANCE: High accuracy bearing ball to ensure the stability of bearing rotation. The curved edge of the roller reduces the area of adhesion to the track and reduces drag CORROSION RESISTANT STAINLESS STEEL: Stainless steel material track roller wheel possess corrosion resistance, good mechanical properties, high strength RUSTPROOF TREATMENT: Galvanized technology is adopted to make the surface coating thicker, thus ensuring better rustproof performance of pulley CONVENIENT AND EASY TO USE: Widely used as sliding track pulley, save space, easy to use, very practical WIDE APPLICATION: Can be used as an alternative to barn door rollers, sliding door rollers, or garage door wheels, warehouse slide wheels, etc. Specification: Item Type: Track Roller Wheel Material: Stainless steel Wheel Diameter: Approx. 38mm / 1.5in Total Length: Approx. 105mm / 4.13in Wheel Spacing: Approx. 40mm / 1.57in Screw Thread Type: M10 Package List: 1 x Track Roller Wheel Package List 1 x Track Roller Wheel