Prime-Line Products D 1798 Sliding Door Roller Set with 1-1/4-Inch Nylon Ball Bearing, 2-Pack Plastic tires Constructed w/steel ball bearings Concave (Grooved) 2 axle pins 2 rivet axles 2 binder posts with 8-32 x 1/2 inch screws Can be used to repair many different patio door roller assemblies