dual finish brass & satin nickel Sterling BS3 ETD5050 50mm Int x 50mm Ext (100mm) Thumbturn TS007 3 Star Police Approved Secured by Design Euro Door Cylinder,

This Eurocylinder with internal thumbturn lock replaced my unsafe double-cylinder lock on one of my fire exit doors. It was a direct replacement because I measured the old one first. It is working well and now provides safe, quick exit in case of fire. For security, outside doors with glass panels within reach of the interior thumbturn knob should not be used with this lock. If necessary, secure the door (no easy access panels!) rather than fitting double eurocylinder locks! I believe that this is a legal requirement for main fire exit doors for many residential premises now.

The lock operates correctly everytime from the key side but intermittently from the thumb turn side. It appears after using the key on the other side the thumb turn cannot connect and just spins. After a while it connects again and works until the key is used at which point it then doesn't work again

The cylinder broke after 2 weeks of use. When trying to lock the door, the thumbturn keeps turning and doesn't catch the lock. When I took the cylinder out, it wasn't rotating when the thumbturn was being turned. Two weeks of use and its broken.

Turn thumb spins around without engaging with the lock mechanism, sometime have to turn it 120 times before it engages with lock bolt, very dangerous if there was a fire, have ordered a different lock at £44:00DONT BUY THIS ITS DANGEROUS!

Not durable at all. After about 6 months the thumb turn mechanism now keeps spinning. I expect a lock to last years.. Waste of money.