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 No. R240-14 for roller covers and model No. RR642-14 for 14" frame.