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Quietly and can reduce door noise by up to 75% Professional 6200ZZ bearing with heavy duty shaft Smooth rotation and low friction Sealed prevents ingress of impurities,sturdy and durable,simple to install Package Include 12 Pack nylon garage door roller Garage door rollers include a groove to disperse grease lubricating oil ,protective dust shield on top end of shaft just below wheel,caged bearings also protect from dust and grime. "Sealed" so each roller has a hardened steel 13-ball bearing encasement,manufactured to exceed the industry standard of 10,000 up. Each roller has a hardened steel 8-ball bearing,reinforced dual-cage 6200ZZ bearing, sealed cover and double plating not only reduces door noise up to 75% more than standard rollers, but offers lifetime operation. Method 1 - Slightly bend track at seam to remove, replace roller, and move door to do next roller (repeat on other side).Method 2 - Remove screws that attach brackets to your door, secure cable before releasing bottom brackets that are under cable spring tension, clamp cable to track, slide out old rollers, place new rollers in their place, and screw in backers. To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.







