A4 316 Stainless Steel Wood Screws with Torx or Star Drive Double Countersunk Screws available in extra long lengths. Torx TX20.

A4 is the best option for coastal regions and woods with high levels of tannin such as Green Oak.

4.5mm x 20mm Full Thread	4.5mm x 25mm Full Thread	4.5mm x 25mm 18mm Part Thread
4.5mm x 30mm 18mm Part Thread	4.5mm x 30mm Full Thread	4.5mm x 35mm 24mm Part Thread
4.5mm x 35mm Full Thread	4.5mm x 40mm 24mm Part Thread	4.5mm x 40mm Full Thread
4.5mm x 45mm 30mm Part Thread	4.5mm x 45mm Full Thread	4.5mm x 50mm 30mm Part Thread
4.5mm x 50mm Full Thread	4.5mm x 55mm 36mm Part Thread	4.5mm x 55mm Full Thread
4.5mm x 60mm Full Thread	4.5mm x 60mm 36mm Part Thread	4.5mm x 70mm 42mm 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)

3.0mm Diameter	3.5mm Diameter	4.0mm Diameter
4.5mm Diameter	5.0mm Diameter	6.0mm Diameter
8.0mm Diameter	10.0mm Diameter

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.