Model 36SRG. Adjustable spring loaded 3 wheel guides for installation as original equipment or in ride-improvement renovation. Moderate speed and Capacity. Long Mileage — Low Maintenance. No Fire Hazard — operates on dry rails. Built in adjustable stops. Fully adjustable for 15 lb. to 30 lb. rails. Height: 11?. Mounting Base Width: 9?. Overall Width: 13-1/4?. Depth: 8?. Shipping Weight: 21 lbs. Wheels: Rolling surface: 1/2?. Diameter: 5-3/4?. Bore: 5/8?.Mounting ?Bolt Holes: Front-to-rear, centers: 3? (with 3/8? adjustment). Across, centers: 5-1/2?. Face of rail to front bolt holes: 2?. Rated Capacity: Gross load of 8500 lbs. per shoe.