The deck clip/anti-walking clip is both used to control the small amount of expansion & contraction produced by each board.
FWAWC50Anti-Walking clips are supplied in packets of 50 c/w blackened stainless steel screws.
One anti-walking clip should be used per decking board regardless of the length of the board and the anti-walking clip should be used in place of the standard deck clip over the joist that is closest to the centre of the board.
Refer to the fixing guidelines to confirm the fixing method when using anti-walking clips on metal joists.