DEFENDER is the metallic part that protects the lock cylinder from the exterior side of the door.

At SIAMO we protect the cylinder with authentic, certificated DEFENDER, manufactured by a special alloy of metals which make them resistant in cutting, drilling and bumping. The rotor is made of steel and as rotates, it provides anti-drilling protection. A specific characteristic in the design of authentic DEFENDER is their conic basis in a shape of perimetric ‘mouth’. The DEFENDER is installed in the interior side of the shielding during the door’s construction. The manganese plate of SIAMO TOP SYSTEM is specially designed in a way that makes the DEFENDER perfectly fitted into and make impossible its removal from the door.