Double End Heavy Bag Anchor allows you to secure your heavy bag or double-end striking bag without having to drill holes in the floor. The portable anchor weighs down heavy bags. Constructed of Non tear high-quality Maya Hide Leather, nylon web straps and Heavy Duty D Shackle treated with Special Red Oxide anti-rust formulation. Fashioned with Heavy duty zip-fastened closure ensures maximum fill potential (can be used outside). Comes Unfilled can be filled with sand.