Locks for Double Hung Windows Whitco CYL4 Mini Push LockSuitable for sliding, casement, awning or double hung windows. Whitco CYL4 Mini Window BoltSuitable for sliding, casement, awning or double hung windows. Whitco CYL4 Multi BoltSuitable for sliding, casement, awning or double hung windows. Whitco CYL4 Window BoltSuitable for sliding, casement, awning or double hung windows. Whitco Keyed Sash LockSuitable for double hung windows. Whitco Safety Sash LockSuitable for double hung windows.