This MACO MK2 extension works with the MACO MK2 casement shootbolt gearboxes and is a fast-fit, non croppable shootbolt system.

Key features:

Sold as a single shoot bolt, one pair is needed per gearbox.
Rapid-fix, extendable gearbox version gives quick fabrication time
no cams, 7.7mm or 9mm mushroom cams available 
9mm mushroom cams, which is also suitable for Residence 9 profile

Guarantees & accreditations:

240 hours salt spray corrosion resistance

Gearbox is sold separately you can buy the gearbox here
https://www.upvc-store.co.uk/collections/window-gearboxes-1/products/maco-mk2-upvc-window-lock-shoot-bolt-7-7mm-9mm-mushroom-gearbox-20mm-22mm-back-set-340mm-arms-non-croppable