From The Anvil BZP Excal - Gearbox (No Claws)

This backset is Police Preferred Specification, and is one of the most effective ways to secure PVC, timber, and aluminium casement windows. Intended for use on windows with a centre mullion when central locking is not required. Ten year mechanical guarantee. BZP, or 'Bright Zinc Plated', products are made from steel and plated with a thin layer of zinc using an electric current, to protect against rusting and oxidisation.

Case Size: 158mm (H) x 12mm (T)
Backset:22mm