5/16-9 x 2 1/2 A/F .428-.437 Head Hgt .300-.312 Unslot Indent Hexwash Lag Screw Full Thread Zinc 2-12 while the 8 refers to

while the 8 refers to its length in inches

It is zinc plated for corrosion resistance and features a ribbed neck that helps to prevent the bolt from turning when tightened

They come in a pack of 100

these screws are ideal for use in wood

5/16-9 x 2 1/2 A/F .428-.437 Head Hgt .300-.312 Unslot Indent Hexwash Lag Screw Full Thread Zinc 2-12 while the 8 refers toThe 5 16 9 x 2 1 2 A F . 428 . 437 Head Hgt . 300 . 312 Unslot Indent Hexwash Lag Screw Full Thread Zinc is a high quality screw designed for a variety of applications. It is made of durable steel and has a zinc coating for added corrosion resistance. The screw has a hex washer head with an un slotted indent, and it is fully threaded for maximum holding power. It is ideal for use in wood, metal, and plastic.