This MACO 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. The extensions are sold seperately to the gearboxes. This item is the gearbox only.
The MACO gearbox is available in 20 and 22mm backset. The 22mm backset version usually has "BS22" printed into the side of the gearbox, the 20mm version has "BS20" or no code.
This Maco window lock is sold non handed. It's 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.