Hello! This listing is for two (2) air brake shoes and one (1) Brake hardware kit that services one wheel. The brake size is 12.25 drum diameter by 4 inches wide for a 10k trailer axle with air brakes. Replaces Dexter part numbers 040-164-01, 040-164-02, 040-164-03. If you have any questions or are looking for a different type or size of brake, we can help! Send us a photo and we can help identify what you have, our stock of brake shoes and pads are like no other! We strive to have the widest availability of brake shoes and brake pads ready to ship.