Stainless Steel wood screws 5mm diameter in A4 316 Marine grade which is the best option for wood such as green Oak which has high tannin levels. With a Torx Drive (Star Drive) and Double Countersunk for head reinforcement. These screws are available in extra long lengths and have a part thread.
A4 available for marine environments. Double countersunk Heads For extra strength and sharp points to eliminate pre drilling even in most hardwoods. Ribs under head on 6mm x 140mm and above, on 8mm and 10mm Diameter. Reinforced double countersunk Head European technical approval ETA 11/0283 (Diameter 3,0 and 3,5 not component in the approval)
Stainless Steel A4 316 marine grade wood screws with a double countersunk reinforced head.
Available with plain head and sharp point or Ribbed head and cutting tip.