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This Harmer Uni-Ring is part of an innovative system that enables you to achieve a 16mm Deck Void on waterproof substructures. It offers effective drainage and is incredibly quick and easy to install, thanks to the fact that there™s no need for bedding or grouting materials. If you require even more deck void, you can use a maximum of two Harmer Uni-Shims to achieve an additional 3mm per shim. Features & Benefits: Harmer Uni-Ring 16mm Deck Void, 176mm diameter, 16mm deck void and 25mm total height, For use on waterproof substructures, Provides drainage and easy installation without bedding or grouting, Combine with up to two Harmer Uni-Shims for an extra 3mm of void per shim. Harmer Uni-Ring 16mm Deck Void Polypropylene