6-18 x 2 1/4 Phillips Bugle Head Fine Thread Drywall Screw Black Phosphate NST They have teeth on the

They have teeth on the inside diameter that bite into the mating surface

5/16-18 x 2 1/2 Carriage Bolt Galvanized

They are also suitable for use in heavy-duty industrial applications

This hex nut is designed with a 1/2-13 thread size

Their plow-shaped head provides a secure hold and prevents the bolt from turning when tightened

6-18 x 2 1/4 Phillips Bugle Head Fine Thread Drywall Screw Black Phosphate NST They have teeth on theThese 6 18 x 2 1 4 inch Phillips bugle head fine thread drywall screws are made of steel and have a black phosphate finish. They are designed for use in drywall applications, and their fine thread helps to prevent them from stripping out. The bugle head provides a countersunk finish, and the Phillips drive makes them easy to install. These screws are sold in a box of 100.