Simpson Strong-Tie S10250DBB Screw, #10 Thread, 2-1/2 in L, Coarse Thread, Bugle Head, Square Drive, Type 17 Point

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 in Dia, #2 square drive bugle head. 'Beaver Bite' type 17 auger point for extra fast starts. For pressure-treated lumber.