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Litepak Garage Door Roller Wheel, 2" Quiet Durable Nylon, Premium Sealed 13-Ball Bearing Size Name:4 Inch This can cause your batteriesAbout this item: You will receive 12 Garage Door Rolers Stem Size: 4" Stem, 2" Wheel 7 Inches 17. 78 cm Sealed cap prevents dirt, dust, rust, grime, moisture, from infiltrating the bearings Works well with a variety of garage doors Quiet! This nylon roller was designed to reduce noise significantly from standard rollers