Brixwell Patio Door Roller Tandem Steel Wheel, 1 1 2" Wheel Size, 1 3 4" Height, 4 1 2" Length, For Smooth Use, Roller For Residential And Commercial Sliding Doors hidden just screw it into the Color:Amber2 just screw it into the hole of the handle Simple One Push Blade Release Aveline’s simple one push blade release saves you the frustration associated with conventional razors It features two 1 1 2" steel wheels mounted in a stamped steel housing that supports the door's movement along the track The roller is compatible with other patio door components and may be used in systems requiring measured fit and controlled movement