Bronze Star Corrosion-Resistant Star Drive Construction Lag Screws with built on Round Washer Head, 1/4 x 2-Inch 100 ct Jar. Use T-25 bit and includes one FREE one inch bit. Great for boardwalks, bridges, ledger boards, timber construction, insulation panels and post to post applications. Triple dipped coating has shown over 1200 hours of corrosion resistance in both salt spray testing and treated lumber.