No. 1 choice of professionals. Advanced threadform technology. 3/16 inches diameter X 1-1/4 inches length. 5/32 inches X 3-1/2 inches Tapcon drill bit included. Approved for treated lumber. Approvals/Listings: ICC Evaluation Service Inc. ESR-1671. Miami-Dade county product control approved. www.tapcon.com. Learn more www.tapcon.com 877-489-2726 Anchors made in USA from Canadian steel. Drill bit made in China.