5/16-18 x 1/2 Unslotted Indent Hex Washer Thread Cutting Screw Type F Full Thread Black Oxide NWP22 Their 2 1/2-inch length provides

Their 2 1/2-inch length provides ample grip

The M3 x 16W7 JIS B1188 Phil Pan Split Washer Flat Washer Sems M/S Zinc Yellow is a type of washer that is used to distribute the load of a screw or bolt

The screw has a round head with a slotted drive

These screws have a flat head with a Phillips drive

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

5/16-18 x 1/2 Unslotted Indent Hex Washer Thread Cutting Screw Type F Full Thread Black Oxide NWP22 Their 2 1/2-inch length provides5 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