8 x 1 1/4 Six-Lobe (Torx) Bugle Head Coarse Thread Sharp Point Deck Screw Dacrotized 5/16-18-.275 while the square head prevents

while the square head prevents spinning during installation

The bolt is 3/4" long and has a diameter of 1/2"

The washer has a split design that allows it to conform to the shape of the bolt or nut

They are made of steel and have a Dacrotized coating for corrosion resistance

meaning it is strong and durable

8 x 1 1/4 Six-Lobe (Torx) Bugle Head Coarse Thread Sharp Point Deck Screw Dacrotized 5/16-18-.275 while the square head preventsThese 8 x 1 1 4 Six Lobe (Torx) Bugle Head Coarse Thread Sharp Point Deck Screws are designed for use in outdoor decking applications. They are made of steel and have a dacrotized finish for corrosion resistance. The six lobe (Torx) drive system provides a secure hold and prevents cam out. The bugle head design countersinks the screw head below the surface of the wood for a clean, finished look. The coarse thread design provides strong holding power