Heavy Duty Professional grade frame with a chrome-plated 5/16" (8mm) shank and 90 degree angle. Tough, fiberglass-reinforced nylon cage and end caps contain smooth-rolling internal bearings, eliminate shank wear. The special cage design provides uniform support of the roller cover to aid in even paint application and roller cover wear. Unique retaining springs prevent roller cover slippage but still allow for one-tap release of the roller when ready to clean up or change colors. Full-size, non-slip, polypropylene grip handle has reinforced threads which accommodates all extension poles.