Ultra Play"s Discovery Center 4 Mounting Kit is required to install your play structure safely and to meet commercial playground standards. Prior to choosing a mounting kit, it"s best to identify the most appropriate surface material for the play area. The ground spike with 8-inch footer mount kit is ideal for engineered wood fiber (EWF), while the Anchor Bolt with 2-inch footer is best used with resilient surfacing such as rubber tiles, poured-in-place surfacing, or bonded rubber surfacing. These two kits are the surface mounting options. The in-ground kit can be used with either kit for in-ground installation and is appropriate when laying wood fiber on sandy or loamy soil, as well as when installing rubber tiles or poured-in-place surfacing over a non-concrete base. About Ultra Play For over 20 years, the goal of Ultra Play has been to build communities through play. Ultra Play firmly believes that advancing play through research, education, and partnerships provides the foundation for stronger communities worldwide. Ultra Play play systems have been designed to be commercially and ADA compliant, and available in a variety of configurations that best suit the prospective play area dimensions, budget, and needs of the consumer and communities. Integrated learning and socialization activities help children explore and discover their interests with their peers. Because Ultra Play is dedicated to creating high quality, affordable playground equipment that can be enjoyed by all children, their play structures and freestanding equipment are well-suited for not just backyards, but childcare centers, apartment complexes, community centers, and campgrounds as well. * Mounting kit * Available for EWF surfacing, Resilient surfacing, or in-ground installation * Meets commercial playground standards