This Sliding Closet Door Roller has a single, 1-3/16 inch (30.2 millimeter) diameter center grooved steel ball bearing wheel. The housing is 1/2 inch (12.7 millimeter) wide with screw holes 2-1/2 inches (63.5 millimeters) on center. It fits a 2-15/16 by 1/2 inch (74.6 by 12.7 millimeter) mortise slot in the door rail. It is used by several closet door manufacturers.
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Material: Housing: Steel. Wheel: Steel Ball Bearing