Quick release spring prevents roller slippage, yet allows easy 1 rap removal. Fiberglass reinforced cage keeps the roller round. Extremely durable. Smooth internal bearings eliminate shank wear that causes graying and streaking. Chrome plated 5"16" shank. 4" rollers are perfect for painting house lap siding, small objects, wall or ceiling edging, and trim. They are also the standard size for striping parking lots, factory, and playground areas. Polypropylene grip with reinforced threads for all extension poles. Refer to model