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From Harmer, this Modulock Deck Support Additional Extension Coupler is best used alongside Modulock deck supports. It increases height adjustment ability. You can easily place it onto the threaded rod to be screwed into position until the height you require is obtained. Each extension coupler has a length of 125mm.Harmer Modulock deck supports make for simple height adjustments of paving slabs, timber or plywood sheet decking. In turn, you can successfully level out irregular, uneven or sloping surfaces for spaces that are more functional. A raised pedestal system, Harmer Modulock can be used to hide drainage, pipework, and services underneath a substrate. It is compatible with terraces, walkways, balconies and ballasted flat roofs. Features & Benefits: Harmer Modulock Deck Support Additional Extension Coupler, Cost-effective, Easy to use, Increases height adjustment ability, Extension couplers have a length of 125mm, Enhances functionality of sloped spaces, Screwed into positionEasy to use and equipped with self-levelling heads that permit gradient changes of 5%, they have anti-noise and anti-slip rubber layers.. Harmer Modulock Deck Support Additional Extension Coupler Polypropylene