Like other Button-fix products, Type 3 Button-fix Connects parallel panels where the emphasis is on strength and Marker Tools help the ease of connecting and reconnecting panels Simply connects parallel panels, including panels with no clearance at the side. It can be surface-mounted or semi-recessed into the panel and its installation depth matches the Type 1 Button-fix, allowing the two fasteners to be used to hang adjacent panels. Panel Fixing Made Easy, Manufacturer: Button Fix