280kg Holding Force Magnetic Lock – 280kg ( 600lbs) holding force magnetic lock is for single or double glass door, wooden door, fireproof door, sliding door and metal door etc. Inbuilt dry contacts lock status signal output (NO,NC,COM). A door can be kept closed using the holding force of a low-voltage magnet. HSMAG’s line of electro magnets is suited for high-traffic applications as well as for easy installation on glass doors.