... same as MUL-T-LOCK system 3.high security zinc alloy cylinder lockCylinder body Length : 60mm,70mm,80mm,90mm , ... material :Lock Cylinder, : iron, brass, zinc alloy and aluminumLock cylinder core : brass, zinc alloy, brass and iron together.Cam : sintered steel ( ... body, zinc core/brass core, iron hoodle, iron normal/computer keys.Low-grade device : iron/alunimun/zinc body, zinc alloy core, iron hoodle ...