Plastic Bearing Glass Balls 1/2" x 1 1/8" x 5/16" inch Ball Bearings1 2" x 1 1 8" x 5 16" Plastic Radial With Glass Bearing One Bearing 1 2" x 1 1 8" x 5 16" Plastic Radial With Glass Bearing One Bearing 1 2" x 1 1 8" x 5 16" Plastic Radial With Glass Bearing, Bearing is Polymer Raceways with glass, inner diameter is 1 2" inch, outer diameter is 1 1 8" and width is 5 16" inch. Item: 1 2" x 1 1 8" x 5 16" Bearing Type: Plastic Radial With Glass Bearing Material: POM (Polyoxymethylene) also know as Acetal Inner