8 x 1 5/8 Six-Lobe (Torx) Flat Nibs Deck Screw Type 17 2/3 Thread Zinc Bake 1,000HR Salt Spray D125A188B which means that it has

which means that it has a nylon insert that grips the bolt or screw and prevents it from loosening

The flex type design allows for easy installation and adjustment

Its 3/4-inch diameter and 3 1/2-inch length provide ample strength and holding power

and marine

It meets Grade 5 specifications for strength and durability

8 x 1 5/8 Six-Lobe (Torx) Flat Nibs Deck Screw Type 17 2/3 Thread Zinc Bake 1,000HR Salt Spray D125A188B which means that it hasThese high performance 8 x 1 5 8 Six Lobe (Torx) Flat Nibs Deck Screws Type 17 2 3 Thread Zinc Bake 1,000HR Salt Spray are designed for superior holding power and corrosion resistance in outdoor decking applications. The six lobe drive system provides maximum torque and prevents cam out, while the flat nibs reduce splitting and ensure a flush finish. The 17 2 3 thread pitch offers optimal grip, and the zinc bake coating provides excellent protection