The Maco MK2 shootbolt espagnolette gearbox is designed for side or top hung Upvc window applications. These centre gearboxes are designed to work in conjunction with adjustable extension bars (Maco Shootbolt Bar, Rod Extensions for MK2 Maco Gearbox). The Maco Shootbolt Espagnolette is compatible with all standard espagnolette handles with 43mm fixing centres and 7mm square spindle.