This Steel Challenge target comes with a High Velocity 8" square plate attached to a bracket designed to hang onto a 2 x 4. The plate attachment uses a bolt and spring to enhance the "Ring" effect for maximum feedback. The base includes a bracket that utilizes thumb screws to allow for securing the 2 x 4 tightly. 2 x 4's (not included) can be cut to any height to suit your needs. All collapses down for a lightweight, easy to move target system. Add several to your range, with different height 2 x 4's to create a fun, challenging shoot. Come in 8", 10", and 12" squares and circles.