Adjustable; heat treated; high tension steel spring; used by several glass/screen door manufacturers. Roller Edge Type: Concave. Steel roller ideal for coastal environments; resists rust and corrosion.

Stamped aluminum corner; adjusting screw; 1" nylon center grooved wheel; used by Jim Walters.

Nylon ball bearing wheel and housing with adjustable nylon yoke. Contents: 2 Roller assemblies with screws.

Spring loaded, steel housing with top adjusting screw; used by Bay-Mills and other door manufacturers. Roller Edge Type: Concave.

Adjustable steel housing; steel ball bearing wheel fits on doors by Peachtree. Includes 2 roller assemblies and installation screws.

Plastic assembly with aluminum inner housing; plastic roller; attached adjustment screw. Roller edge type; Concave,  fits Andersen Doors.