Designed primarily to remove the rusty nail and saw cut necessity, hence allowing a fixed length perch for individual birdrooms. When fitted, the rear by a single screw and then forward twisted through and located by the cage front vertical wires, the perch becomes stable and firm. All movement of the perch is eradicated allowing a firm base for breeding pairs (squares 16mm, 5/8 inch only). This best selling Riversway product is available in both square and round cut perches. Please specify when ordering. ‘fronts’ fit to the cage and ‘rears’ fit to the wall.