The ABUS E60 Euro profile double cylinders are suitable for wooden aluminium & most PVCu doors They have a precision mushroom pin and paracentric keyway which offers 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 and convenience the outside key can operate the lock with an internal key in place How to measure a Euro Profile Cylinder A Distance from internal end of cylinder to centre of cam B Distance from external end of cylinder to centre of cam