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Hillman 8-Pack 3/4-in Flat Nylon Ball Bearing Tub and Shower Door Rollers in the Bathtub & Shower Door Rollers department at Lowes.com
Amazon.co.jp: 608 U Groove Ball Bearing Built-in Clinique Nylon Plastic Ball Bearings, Guide Wheel 8 x 30 x 10 mm For Guide Roller Hardware Accessories / 0.3 x 1.2 x 0.4 in, : Sports & Outdoors
Amazon.com: HardwareXsupply 2" Nylon Sealed Garage Door Rollers, 6200ZZ High Performance Ball Bearing (10 Pack, 4" Stem) : Tools & Home Improvement
DURA-LIFT Ultra-Life 2 in. Nylon Garage Door Roller with Reinforced Bearing and 4 in. Steel Stem (10-Pack) DLR6200Z - The Home Depot