Simpson Strong-Tie Deck-Drive DSVT DSVT312R5LB Deck Screw, #10 Thread, 3-1/2 in L, Variable Thread, Ribbed Flat Head

The Deck-Drive" DSV wood screw is a powerful fastening solution for preservative-treated decking applications. With its under-head nibs and fast-start tip, the DSV is ideally suited to be driven and countersunk into today's wood deck boards. The shank is designed to withstand the swelling and shrinkage that is common with fast-growth lumber.