DeckWise Bugle Head Stainless Steel Colormatch Deck Screws - #10 x 3-1/8" is designed for wood projects and decks of all kinds including use with hardwoods, thermal wood PT and composites. With its under-head nibs plus fast-start tip, the Bugle-Head all-purpose wood screw is perfectly suitable to be driven in and countersunk into wood and deck boards. The shank is manufactured to endure wood swelling and seasonal shrinkage. A six lobe T25 drive ensures a tight bit fit to prevent cam-outs. Pre-drilling is not required except for exotic hardwoods.