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