This is a U-back patio door roller assembly with a 1-1/8 in. diameter concave, or grooved, steel ball bearing roller in a stamped steel U-back style housing. When installed, the U-back housing is drawn tightly into position against the side stile as the mounting screw or bolt is tightened. The housing is 1/2 in. wide, 1 in. tall with a rear adjusting screw. Most often used by Better-Bilt patio doors.

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