Allgrip Decking Screw 4.5 x 60mm, supplied in a box of 200.
Decking screws have a corrosion resistant coating and a countersunk head designed to pull deck boards tight to the joist without splitting. Used for softwood and hardwood decking, garden structures and outdoor timber.
Drive with a Torx or Pozi bit and pre-drill hardwoods near the board ends.