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This Harmer Uni-Plus is a versatile height-adjustable system that can be easily installed by screwing it into place. It is designed to address height differences ranging from 25mm to 40mm and can be used to install decking in corners and perimeter walls. However, this product is recommended for applications where the deck is parallel to the substructure and not for correcting slopes. Features & Benefits: Harmer Uni-Plus Low-Level Height Adjustment 25mm - 40mm, Screw-in installation, Ideal for corners and perimeter walls, Not recommended for correcting slopes, Perfect for decks parallel to the substructure, 25mm to 40mm height adjustment, 205mm diameter. Harmer Uni-Plus Low-Level Height Adjustment 25mm - 40mm Polypropylene