F/L With Key Override EB250KO. The Alpro EB250 electric solenoid bolt & EB250KO key override solenoid bolts allow for both remote access and exit control of most timber and metal doors. It is also suitable for sliding or swing, single or double action operations. It can be fitted in the frame or in the door. With concealed mortise mounting and slimline styling the bolts suit most narrow stile aluminium doors and narrow profile joinery.. 3 year guarantee. Holding force 1000kg. Bolt throw 14mm. Auto re-lock function