The Caldwell AR500 Plate Rack Expansion adds one additional swinging competition-style target to the AR500 Plate Rack Kit. Built from 3/8" thick rifle-rated AR500 steel, it withstands repeated bullet and fall impact for long-term use, and mounts using the same steel frame hub brackets and 2x4 lumber setup as the base kit. Compatible with the AR500 Plate Rack Kit 3/8" thick AR500 rifle-rated steel target Engineered to withstand repeated bullet and fall impact Adjustable target brackets for falling or swinging plates Dual functioning plate can be shot as a falling plate or suspended as a static/swinging plate Compatible with 2x4 lumber for a customizable setup