Boxer (3-6) Body Only. The Geze Boxer concealed door closer (size 3 to 6) is for use on internal doors which are up to 1,400mm in width and 180kg maximum weight. It is fully tested and approved for fire door usage, and has a fire protection rating of 60 minutes. It is a versatile product as it can be used on right or left mounted doors, as well as featuring fully adjustable closing and latching speed and force, plus adjustable hydraulic backcheck. The guide rail is only visible when the door is in action which provides a neat and tidy appearance, and the closer is available as either body only or the full closer.. Concealed closer integrated into the door leaf. For use on single leaf doors of up to 1,400 mm leaf width and 180kg weight. Suitable for use on fire and smoke protection doors. Adjustable closing speed, force and latching action