7 for torsional strength and drill speed

The #12 x 4 1/2 size provides sturdy fastening in decks

3/4-10 x 5 Grade 8 Hex Cap Screw Yellow Zinc Plated

9/16 x 8 Ship Auger Wood Bit

1 1/4-7 x 6 1/2 Socket Cap Screw Alloy

#10 x 1 Simpson Flat-Head Deck-Drive™ DWP Wood Screws 305 Stainless Steel (T25) - Box (4500) 3/8 Cotter Pins 18-8 Stainless Steel 7 for torsional strength andSimpson Deck Drive DWP Wood Screws are designed specifically for outdoor wood construction projects. Made with 305 stainless steel for long lasting resistance against corrosion, these #10 x 1 screws feature a flat head and T25 Torx drive for fast, secure installation. Each box includes 4500 screws.