Check the listing for details. 1-1/2 In., Nylon Roller With Ball Bearing Replacement (2-pack). Condition: New. Listed at 6.99 USD. Plastic rollers are rust resistantBall bearing roller for a smooth sliding actionGrooved edges allow easy gliding over a raised edge This is a combination of a 1-1/2 inch diameter nylon concave or grooved ball bearing roller that is 5/16 inch thick with a 1/4 inch axle hole and a combination of 5 different axle choices. Depending on the application, you can choose to rivet the roller into place or use a roll pin, drive pin, binder post and screw or bolt and nut. Regardless of how you need to install the new roller into your existing roller housing, in most cases, one of the five choices will work.Used by a variety of patio and closet door roller assemblies1-1/2 inch diameter roller1/4 inch axle holeNylon concave roller with a steel ball bearing5/16 inch thick2-packUsually installed with a rivet in an assemblyFor further dimensional information, please see the line drawing