The Maco MK1 gearbox mechanism was designed as a high security product.

Available in 2 back set sizes of either 20mm or 22mm.

Gearbox mechanism only.

Information from the manufacturer

MACO shootbolt espagnolettes for casement windows incorporate all the benefits of safety and security expected of modern window technology in
today’s environment. MACO shootbolt espagnolettes have been vigorously tested for security and performance above the requirements of industry standards.
For performance they have been endurance tested to 40,000 operations and salt spray tested in accordance with BS EN 1670, silver look class 4 and tricoat class 5.