SPAX PowerLags 4581820801005 Lag Screw, 5/16 in Thread, 4 in L, Partial Thread, Washer Head, T-Star

SPAX PowerLags offer the largest selection of code-recognized structural wood-to-wood fasteners in the industry. Featuring SPAX patented thread technology, they require no pre-drilling and drive faster and easier than conventional lags and other structural lag screws. HCR high corrosion-resistant coating option for use in interior or exterior applications, including treated lumber.