Features 1、WEAR RESISTANT 45 STEEL: Made of good quality 45 steel material, wear resistant and sturdy, possess high strength 2、STRONG LOAD BEARING: Double wheel design, 48mm diameter, bring stronger load bearing, simple installation and convenient use 3、VARIOUS USES: Suitable for guide rails, rolling gates, sliding doors, industrial machinery, wire rope track devices, etc. 4、FLUENT OPERATING: Groove wheel come with V shaped bracket design to operate more fluent, fluent without lag, very dependable 5、STABLE: Sliding door hardware V shaped groove wheel come with stable structure, excellent performance and long service life Specification Item Type: Groove Wheel Material: 45 Steel, White Zinc Plated Size(LxWxH): Approx. 130 x 33 x 60mm / 5.12 x 1.3 x 2.36in Wheel Diameter: Approx. 48mm / 1.89in Wheel Width: Approx. 24mm / 0.94in Package List 1 x Groove Wheel