Guardian, PGT, PPG, Atrium Patio Doors, Silverline, American Craftsman Tandem Style, Dual Actuating / Floating Roller Wheel Assembly - All Models Steel Wheel, Nylon Wheels, and Stainless Steel Coastal Wheels - 1 1/8", 1 1/4" and 1 1/2" Diameter. Sliding / Gliding / Glider Patio Doors with ZYD Metal Housing. PRICED PER PAIR / ONE DOOR SET of (2) ROLLER ASSEMBLIES. 

In The "comment section" at checkout - SPECIFY WHEEL AND DIAMETER. If none is specified, we will ship 1 1/8" Steel.