The built-in washer head eliminates the need for an additional washer

3/4-10 x 2 3/4 Socket Cap Screw 18-8 (A2) Stainless Steel

5/8-11 x 5 Flat Socket Cap Screw Alloy

9 x 3 1/2 Simpson Trim-Head Wood Decking Screws - Square Drive 305 SS - 1 lbs Pack (62)

9 x 3 Square Flat Particle Board Screw w/ Nibs T17 Zinc Plated - Carton (2,000) #10 6-Lobe Flat-Head Simpson Deck-Drive DWP Wood Screws 316 Stainless Steel The built-in washer head eliminates9 x 3 Square Flat Particle Board Screw w Nibs T17 Zinc Plated Carton (2,000). Wood screws used for interior wood applications. Asymmetrical thread pattern resists material slippage during pull out and vibration. Counter sinking NIBS for a flush finish. Type 17 tip reduces wood splitting. Superior holding power.