This is the VERSA Euro Double Cylinder.
A quality 6 pin mechanism with a dual finish to suit brass or satin finish door handles meaning you no longer have to hold stock of Satin and Brass euro cylinders for each size, effectively halving the amount of euro cylinder stock you need to hold.
The VERSA euro double cylinder has sacrificial breakpoints on both sides of the cylinder so you only need to stock one of each size which also reduces the number of cylinders you need to hold in stock. It also has anti-drill and anti-pick pins, making the cylinder robust and very secure.