Made of polyamide, stainless steel and plated brass. This lock is used on acrylic or wood doors, bi-fold and swinging doors, hatch es and companionway drop-in boards with a maximum door thickness of 7/16″. No fasteners required. Available in white or black finish. INCLUDES key lock on exterior with sliding lock button on interior side of lock. Spacer available for 3/8″ door thickness – Special Order Only.