These highest security shutters are used for properties with higher risk of attack. Having nearly 4 mm thickness of durable extruded double profile aluminium these potentially could be a bullet proof version from 9 mm pistols however due to having connection lines couldn’t be tested and are absolutely nightmare for burglars who wants to use angle grinders to cut them. Comes with thicker and wider side rails. Always has bottom rail. As a standard comes with 2 remote controls.