At SIAMO during the construction of a security door, we shield the lock in a unique way, so that the access in its main body will be impossible in future burglary attempts.

In all armoured models of our company, two additional metal plates, a steel plate of 4mm thickness and a specially formed manganese plate that restrains the defender of 2mm thickness, are welded in the external shielding of door covering the body of the lock. Like that an overall lock protection is achieved by successive, strong metals of a total thickness of 7 to 20mm.