Sealed 6200ZZ ball bearing garage door rollers for residential and commercial doors. Includes 12 rollers with a 2-inch wheel diameter. Each roller rated for 100,000 cycles with a load capacity of 150 lbs. Nylon shell reduces noise and ensures smooth, quiet operation. Durable construction with nylon and metal materials. Specifications: - Wheel thickness: 0.48 inch - Wheel diameter: 1.8 inch - Overall length: 4.78 inch - Shaft length: 4.25 inch - Shaft diameter: 0.43 inch - Color: Black - Material: Nylon + metal Package includes: 12 x Garage Door Rollers. No additional items included. Note: Display lighting and screen settings may cause slight color variations. Measurement may vary by +/- 1-3 cm.