The Vevor electric trailer brake assembly kit is designed for 3500 lb axle trailers and includes four self-adjusting electric brakes for dependable braking performance. Its 10" x 2-1/4" brake size and 4-hole mounting design support straightforward replacement and installation. Built from durable materials with asbestos-free semi-metallic brake pads, this kit is made for long service life. It is suitable for towing trailers, hauling goods, camping trips, and other trailer applications. The package includes 2 right-hand and 2 left-hand brake assemblies.