The ABUS E60 Euro profile double cylinders are suitable for wooden, aluminium & most u PVC doors. They have precision, mushroom pin & paracentric keyway which offer comprehensive anti-pick protection, also they have a hardened steel anti-drill spring & pin protection with 8 anti-drill pins in every keyway. For emergency & convenience feature the outside key can operate the lock with internal key in place. How to measure a Euro Profile Cylinder: A Distance from one end of cylinder