Countersunk stainless steel A2 (AISI 304) decking screw with 3 Thorns tip for timber decking in outdoor and coastal environments. 3 Thorns tip — minimum installation distances, more screws in less space Asymmetrical umbrella thread, elongated reamer cutter and under-head cutting ribs for higher torsional strength A2 austenitic stainless steel AISI 304 — high corrosion resistance Suitable for outdoor applications up to 1km from the sea — C4 corrosion class Suitable for class-T4 acidic woods For timber boards up to 470 kg/m³ without pre-drilling, up to 620 kg/m³ with pre-drilling CE marked to EN 14592 Drive: TX20 (4/4.5mm) · TX25 (5mm) Material: Stainless steel A2 AISI 304 · Service class: SC3 Price shown is per box. Select diameter and length to see pack quantity and price.