Discontinued 

Arcadia Straight Spring Tension Roller Assembly with 3/4 Inch Nylon Wheel for Sliding Screen Door.
Roller Assembly consists of 3/4 inch center grooved nylon wheel, nylon guide roller and heat treated, high tension, flat spring.

This Roller fits as a top Roller on Arcadia Doors, locks into grooves in the door frame

Spring Type: Straight-Spring
Roller Edge Type: Concave
Roller Material: Nylon
Roller Width: 3/16 Inch
Roller Diameter: 3/4 Inch

Contents: 2 Roller Assemblies
Priced and Sold in Pairs.