The GU Europa 2 Hooks & 2 inboard rollers 35mm features 2 hooks and 2 inboard rollers for compression. It has a 16mm faceplate with square ends. Locking points are engaged by lifting the lever and locked by turning the key. To change handing, push a flat bladed screwdriver into the small rectangular slot above spindle and pull out latch at same time. Reverse and reinsert.