DeckWise Extreme4 IPE Clip Hidden Deck Fastener Kit, (1050 Pcs), Black - Woodcraft

It is easy to choose between a short and tall clip: Short clips will work on any board, but some people choose to use the tall clips. Short clips will work on any board thickness, but the tall clips are ordered for what the industry describes as "5/4 Board", which means any board thickness exceeding 1". Extreme or Extreme4 clips work on all hardwoods. However, the ExtremeKD is typically used on composite decking because it provides the 1/4" gap spacing that many composite boards require.