Grip Centers: 8"Grip Length: 8.875"Grep Width: .875"Grip Projection: 2"Track Length: 78.75"Track Width: 1.5"Track Thickness: .25"Roller Diameter: 2 3/4"Roller Strap Length: 4.625"Heavy duty powder-coated steel track and roller straps for resistance to corrosion, UV weathering, and scratchesIncludes single track, 1 pair of roller straps, 1 pair of door stops, 5 track spacers, 2 track protectors, a floor guide, grip, all mounting hardware, and detailed installation instructions 5-year mechanical and finish warrantyFor single, interior doors 1 3/8"-1 3/4" thick, 28"-36" wide, and up to 300 lbs.Required ceiling clearance: 7"Quiet Glide Wheels for Smooth OperationAdjustable Rubber Stops