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For this reason, a depth greater than the minimum recommended should be considered. Unitary materials are generally rubber mats or a combination of rubber-like materials held in place by a binder that may be poured in place at the playground site and cures to form a unitary shock absorbing surface. 3 Installation of the Lift & Lock Swing The Lift & Lock Swing can be attached to a swing set, pole or tree branch. IMPORTANT! When installing the Lift & Lock Swing, be sure it cannot swing to within o