5/16" x 3-1/2" Zinc Plated Grade 2 / A307 Steel Hex Head Lag Screws

Diameter: 5/16"
Length: 3-1/2"
Material: Steel
Finish: Zinc
Head Style: Hex (1/2" Wrench)
Point Type: Gimlet
Thread Length: Partial
Hardness: Grade 2 / A307
Type: Hex Lag Screw
A lag screw is similar to a wood screw, but generally is much larger with a hexagonal head. Lag bolts are designed for securely fastening heavy timbers to one another, or to fasten wood to masonry or concrete.