Brighton-Best 5/16" x 3" Hex Head Lag Screws Zinc Plated - 50 per Box (486244)5/16" Diameter3" Length (Length is measured from under the head)Grade 1 Low Carbon Steel Hex Head Lag Screw (Meets SAE J429 & ASME B18.2.1)Zinc Plated to meet ASTM F1941...