Please Read The measurement shown is the overall measurement including 2 shoot bolt and the mechanism, for example 368 - 820 will not give you a single shoot bolt of 820mm the individual shoot bolt will be roughly 300mm.
One shoot bolt per purchase
French casement extensions design for use with the Yale shootbolt gearboxes.
Designed to work with the Yale croppable gearbox Passive leaf extensions with no cams for placement behind the floating mullion Strategically placed mushroom cams on main extensions for optimal weather perfomance and security
7.7mm or 9.0mm mushroom cam heights Suits sash rebate heights between 326-1420mm across 4 extensions
Gearbox is sold separately you can buy the gearbox from links below; Click Here or enter link below https://www.upvc-store.co.uk/collections/window-gearboxes-1/products/lockmaster-yale-upvc-window-lock-gear-box-short-crop-20-or-22-backset