Speed + thread that reduces the screwing time by up to 20 %. Wood screws are used for wooden structures in marine and industrial environments. Material: EN ISO 10088 Treatment: Stainless acid-resistant AISI 316/A4 - Corrosivity class C5-MARIN Bits: TX25 - TX30 Tip: Choose a conical bit when screwing stainless and acid-resistant screws, then you get a better contact surface against the screw, which makes it easier and faster to assemble. Thread lengths: 4x40 - 25mm 4x50 - 30mm 4x60 - 35mm 4,5x50 -30mm 4,5x60 - 35mm 5x70 - 40mm 5x80 - 41mm 5x90 - 42mm 5x100 - 60mm 6x100 - 57mm 6x120 - 70mm 6x140 - 70mm