Fits most horizontal and vertical sliding window systems using this design Solid metal (zinc) construction Durable powder coated finish Design exceeds AAMA requirements Mounting hardware not included These Vision Industries Sash Locks also called Sweep locks work with most horizontal and vertical sliding window systems. This is an upgrade made by the same company that provides the Window Hardware attached to the most popular brand Windows and Doors sold at Home Depot, Lowe's and many other window and door outlets. These locks are being offered at a price that is 40% less than they retail at these same building material outlets.