You are buying one (1) caliper. In photos you will see three calipers you can purchase one, two or three this will also multiply your purchase price. But I will ship the others at no shipping cost if you purchase more than one.

Calipers are numbered please include that number in your information. These have been on the shelf for a couple years and need cleaning and may need the o ring replaced. 

These are for 1.25 / 1 1/4 thick rotor 

Piston size 2.75 / 2 3/4

GM D52 style.