These Euro Cylinders are top quality with an excellent finish. Each Cylinder is supplied with 3 keys as standard.
To remove the lock barrel from your door simply remove the screw located on the side of the door that fixes it in place, then insert one of the keys and slowly turn it while pulling on the key quite hard. You may need to remove or slacken the handles to aid the removal of the lock barrel.
Measure dimension A and B in millimetres as in the photograph. Don't worry which is the inside or outside as the cylinders are reversible. If dimension A=55 and dimension B=45 then select size 45/55.