This MACO MK2 upvc window lock is a three piece system. The MACO gearbox is in the centre of the upvc window with two extensions/corners connected to it with serrated teeth connections. The MACO MK2 gearbox is available in 20 and 22mm backset. This item is the gearbox only. The price is for one gearbox.
There is usually a code on the side of the gearbox:
Code: RH BS20. You need to order the 20mm backset version
Code: RH BS22. You need to order the 22mm backset version
This Maco gearbox is sold non handed. Its usually marked RH on one side however turning the lock 180 degrees when installing makes it operate LH.
The extensions are sold seperately to the gearboxes. This item is the gearbox only.