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This is a plain back patio door roller assembly with a 1-1/4 in. concave or grooved steel ball bearing roller. It is 9/16 in. wide with a 13/16 in. flare, 1 in. tall and 2-1/8 in. long. It is rear adjusting with a 10-32 threaded mounting hole on the back end. It is used by Acorn Doors and a variety of other manufacturers of patio doors.Used by Acorn and a variety of other sliding patio door manufacturers,Plain back housing,1-1/4 in. diameter concave steel roller,Stamped steel housing with ball bearing roller,Features rear screw adjustment,Used on metal framed sliding patio doors,A Phillips head screwdriver is required for installation,For further dimensional information, please see the line drawing