5/16-18 x 1/2 Unslotted Indent Hex Washer Thread Cutting Screw Type F Full Thread Black Oxide NWP22 10-24 x 1 Phillips Flat

10-24 x 1 Phillips Flat Undercut Thread Cutting Screw Type 23 Fully Threaded 18-8 Stainless

The square recess drive provides a secure fit for your drill bit

which means that it can be driven into metal without the need for a pre-drilled hole

These screws have a flat head with a Phillips drive

5/16-18 x 1/2 Unslotted Indent Hex Washer Thread Cutting Screw Type F Full Thread Black Oxide NWP22 10-24 x 1 Phillips Flat5 16 18 x 1 2 Unslotted Indent Hex Washer Thread Cutting Screw Type F Full Thread Black Oxide: Size: 5 16" diameter, 18 threads per inch, 1 2" length Type F: Full thread Head: Hex washer head with un slotted indent Material: Steel Finish: Black oxide Thread cutting: Designed to cut threads into the material as it is installed, providing a secure hold in thin or soft materials Indent hex washer head: Provides a large bearing surface and high torque