Quiet action: Premium PA6 nylon minimize metal to metal, reducing sound levels significantly compared to standard steel rollers for peaceful garage door movement Complete Replacement Set: Includes six essential components for straightforward installation using basic tools, providing a practical solution for garage door maintenance or repairs Long lasting Construction: Coated steel rods resist rust and deformation, combined with reinforced nylon rollers tested for 100, 000 cycles to heavy garage doors reliably Compatibility: 1.8 Inch diameter fit standard 2 inch tracks, with 4.7 Inch rods designed to work seamlessly with most residential and commercial garage door models Sealed Bearing Design: Industrial grade 6200ZZ protected ball bearings and entry while maintaining consistent rotation without needing maintenance, Manufacturer: ljhnba