We have built an enviable reputation for using the finest window systems, so it should be no surprise that we also supply some of the best security features. Our multi-lock is a new concept in window security and comes as standard with all windows. This is a police preferred product, manufactured in the UK to provide the highest level of security. Built to withstand the worst of our weather, our multi-lock is manufactured to marine specifications with anti-salt corrosion protection for coastal use.