4", Zinc Hook Jamb Latch, This Cam-action Latch Is Designed To Hold Wood & Metal Doors Firmly In Place Against The DoorJamb On Farm & Utility Buildings, It Also Can Be Used For End Gates On Stake Trucks, Offers 4" Hook, Designed For RightOr Left Hand Applications, Pre Punched, Reversible Strike Plate For Use On 1-1/2 Or 3-1/2" Thick Door Frames, Boxed.