Simpson #8 x 2" 305 SS Deck-Drive DWP Wood Screw, T20, Flat Head Concrete Spike so you can install it

so you can install it with a 5/16 in

This Brake with 4-Way Die is well suited for fabricating brackets

082 is a 5/16" diameter 2 Flute Dowel Drill with Countersink (With Countersink (70mm))

you will need the instead

Simpson #8 x 2" 305 SS Deck-Drive DWP Wood Screw, T20, Flat Head Concrete Spike so you can install itSimpson Deck Drive DWP Wood Screw in Type 305 Stainless Steel is a high performance exterior fastener engineered for deck boards, dock construction, and general outdoor wood applications where reliable corrosion protection is essential. The #8 x 2" size features a flat head profile, a T20 6 lobe drive, and a sharp point tip designed to penetrate solid wood and engineered wood products cleanly reducing the need for pre drilling and keeping projects