Pack of selected quantity of Valdern Composite Decking Clips and Screws - T clips to fit in composite decking groves and high quality wood screws. (M4 x 35mm) Each pack contains selected pack size of T clips and screws. We recommend 13 T Clips per 4m board and 8 T Clips per 2.4m board. We advise using a PH2 drill bit with these screws. T clips will give a 6mm gap between boards. When installed correctly, these clips will secure the board and give a final expansion gap of 6mm between each Composite Board. It is recommended that these Clips are secured in place using our M4/35 mm Screws and T15 - 50mm Extended Driver Bit. When following our Guidelines, the Quantity of Clips Required per Composite Board is as follows:- 4m / 13 Clips - 3.6m / 12 Clips - 2.9m / 10 Clips - 2.4m / 8 Clips - 2.1m / 7 Clips.