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What is a Sash Jammer?

AS Locksmiths Worcester Blog

A Sash Jammer is an additional security feature used to secure uPVC windows or doors although they can also be fitted to wooden and composite doors and french doors and patio doors too. Sash Jammers can be fitted as locking and non-locking options. Should a thief bypass a lock a Sash Jammer will prevent a door or window from opening.