SIMPSON STRONG TIE S10300DB5 10 x 3 Bugle Head Wood Decking Screws, 5lb Coarse threads approximately 2/3 up shank draw board tightly to substrate Pre-drilling always recommended, and a must near board ends to prevent splits 0.344" diameter #2 Square Drive Bugle Head ; 'Beaver Bite' type 17 auger point for extra fast starts