Made from Solid Brass. Lever Handle for internal and external doors where locking is required. If you are replacing an existing Lever Handle, this Handle will work with a Standard UK Sash Lock. For new doors you will also need to purchase a Sash Lock in a size to suit your door. For a 2 1/2\" Internal Door Sash Lock purchase a YKSL32-AT or for a 3\" Internal Sash Lock a YKSL33-AT. For a 2 1/2\" External Door Sash Lock purchase our British Standard Sash Lock YK BSSL29 or for a 3\" Lock a YK BSSL39. 10 Year Mechanism.