5/16-18 x 3/4 Unslotted Indented Hex Head Thread Cutting Screw Type 23 Full Thread Zinc 3-28 They have a square drive

They have a square drive head that requires a square drive bit to install

The 3/8-16 x 1 1/4 Slotted Truss Machine Screw Fully Threaded Zinc is a versatile and durable fastener designed for a wide range of applications

The 4-40 x 1 1/8 Phillips flat undercut machine screw is a fully threaded screw made of 18-8 stainless steel

The M8 thread size indicates a diameter of 8mm

5/16-18 x 3/4 Unslotted Indented Hex Head Thread Cutting Screw Type 23 Full Thread Zinc 3-28 They have a square drive5 16 18 x 3 4 Unslotted Indented Hex Head Thread Cutting Screw Type 23 Full Thread Zinc: This screw features a 5 16 18 thread size, indicating a diameter of 5 16 inch and 18 threads per inch. Its 3 4 inch length provides ample holding power. The un slotted indented hex head design allows for secure driving with a hex key or socket wrench, preventing cam out. Type 23 thread cutting screws create their own threads as they are driven, making them