N6848 Diameter: 1" Three 0.75" diameter nylon wheels, steel top mount adjustable bracket used on pocket doors, sliding doors, and bi-folding doors. Features: -Pocket door roller. -Material: Nylon. -Mount: Top. Specifications: -Diameter 0.75": 7.44"H x 1.13" W x 3.81" D. -Diameter 1": 9.48"H x 0.75" W x 3.81" D. -Dimensions: 7.44-9.48" H x 0.75-1.13" W x 3.81" D.