This 2-pack of conveyor rollers measure at 36" between frame and are constructed using high-quality 18 ga. galvanized steel. These 1.5" diameter rollers are compatible with 36” between frame, 38" wide conveyor systems that use 1/4" round axles. The spring-retained design makes it a breeze to swap out rollers, making these perfect replacement parts for Ultimation, Hytrol, and Ashland gravity conveyors. Please be advised that this product only includes the rollers, this product does not include hardware or brackets.