Operated from both sides of the door by a key. High durability cylinder rings against pulling, twisting and sawing. Product is tested and certified according to the most demanding standards SFS 5970, SFS 7020, FA security grade 3. This product has Abloy PROTEC² -lock system. Abloy PROTEC² is a factory level locking solution. Every key is carefully controlled and is only made at Abloy Oy's factory. The keys have a patented sliding element that increases key security. One key fits several locks. How many locks a single key opens and who has access to what, can be accurately controlled. Available with multiple different surface treatments.