| Steel, zinc-plated with thermoplastic dials and rollers. Finger-adjustable dial cam provides 5/16'' vertical adjustment to properly hang doors. Wheels are 7/8'' diameter x 1/4'' wide. CD 40-3188 and CD 40-3192 must be used together. . Fine tune dial provide s up to 5/16'' precise alignment of door to jamb. Acetal wheels for silent smooth door operation. |