Surface. The Alpro EMS1200 Compact Shearlock is available in Mortice or Surface Mount models (inc. Glass Mount) and provides slimline dimensions, maintaining a holding force in shear of 1200kg. Other benefits include built in PCB controller with switch selectable features and plug in 3 metre flying leads.. Cycle tested to 500,0000 operations. CE approved. Not suitable for vertical installation. Shear holding force of 1200kg