The Origin Tactical Post Cap is a 2x4 hook cap that will sit onto any wooden 2x4. This additional accessory is great for anyone wanting to set up their own range configuration. The Post Cap has a 3/8 in. thick AR500 steel hook to make it long-lasting. There is a hole on each post cap to allow you to screw the Post Cap to your 2x4 and secure it until you need to replace your 2x4.