Multi Packs of Composite Decking T Clip Fixing to Fit composite decking boards. Fits between the boards, into the board grooves, and screws directly to the decking joists. Polynylon Clips and 40mm length Black 403 Grade Stainless Steel SMALL HEAD decking Screws included. Our screws will not scratch your boards, or rust or break. Full ANTI CORROSION, 6mm board spacing - No unsightly large gaps. Made of high density non perishable Nylonethelene. Hidden Board Fastening system. Suitable for 99% of composite decking boards on the market.