Features: -Premium Garage Door Rollers - White Nylon w/ Ball Bearings -These rollers are very heavy duty and will be the last rollers you need to buy for your garage doors. -These rollers are very durable and are made for the heaviest of doors. -They are also very quiet. -13PCS Ball SEALED Bearing -You will notice a big difference in how smooth and quiet your door is after replacing your old worn out rollers. -Suitable for: automatic garage doors, garage door, solid wood garage doors, garage door anti-pinch handcarts, residential garage doors, garage door engineering, remote control garage doors, garage door villa ,etc. Specifications: -Shank Material : Iron -Wheel Material : Nylon -Sealed Ball Bearing Quantity : 13 Pieces -Shank Diameter : 10mm(0.39") -Total Length : 105mm (4") -Wheel Diameter : 45mm (1.78") -Wheel Thickness :11mm(0.43") Package Included: 1 x Garage Door Roller Wheel