The ABUS KE60 Euro profile thumbturn cylinders are suitable for wooden aluminium & most PVCu doors They have precision mushroom pin and 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 How to measure a Euro Profile Cylinder A Distance from internal end of cylinder Not the thumbturn to centre of cam B Distance from external end of cylinder to centre of cam Thumbturn Cylinders Measurement K is always the thumbturn side of the cylinder and the other measurement Z is external