VEVOR Trailer Hub Drum Kits 5 on 4.5" B.C. with 10" x 2.25" Electric Brakes, Self-Adjusting Trailer Brake Assembly for 3500 lbs Axle, 4-Hole Mounting, Backing Plates for Brake System Part Replacement

VEVOR Trailer Hub Drum Kits 5 on 4.5" B.C. with 10" x 2.25" Electric Brakes, Self-Adjusting Trailer Brake Assembly for 3500 lbs Axle, 4-Hole Mounting, Backing Plates for Brake System Part ReplacementSelf-Adjusting BrakeEasy InstallationLonger LifespanWide ApplicationSuperior PackagingChoices GaloreProduct Lifespan: ≥50,000 km,Brake Pad Lifespan: ≥30,000 km,Set Includes: Single Set (2 Brakes + 2 Brake Drums),Material: Grey Cast Iron + SPHC + Q235,Brake Pad Adjustability: Self-Adjusting Feature,Magnetic Force: ≥450N,Applicable Trailer Weight: 3500 lbs,Magnet Size: 10",Friction Coefficient: 0.48,Brake Size: 10" x 2-1/4",Product Size: Φ11.22" x 2.87" (Brake); Φ10.83" x 5.28" (Drum),Flange Stud Count: 4,Item Model Number: BF10-Z01AB*2,Product Weight: 60.67 lbs,Voltage/Current: DC12V/2.5-3.6A,Brake Pad Size: 2.26" x 0.19