Sliding Door Locks and Hardware A range of sliding door locks and hardware to suit aluminium and timber sliding patio doors and security screen doors. Whitco BlaxlandSliding patio door lock. Whitco LawsonSliding patio door lock. Whitco OxleySliding patio door lock. Whitco MawsonSliding patio door lock. Whitco CYL4 Patio BoltConcealed fixing for security and style. Whitco Flush BoltsDesigned for aluminium door applications. Whitco Safety LatchSelf-latching catch with external release mechanism.