SS screw have round heads (semi-round heads), flat round heads, round head flanges (with washers), flat round head flanges (with washers), pan heads, pan head flanges (with washers), countersunk heads, oval countersunk heads, cylindrical heads, hexagonal heads, hexagonal flange heads, hexagonal flanges (with washers) etc

Marterial: Carbon Steel, stainless steel

Diameter: Self-tapping screws come in a variety of diameter specifications. 

Length: There are diverse length specifications. 

Thread Types: This includes self-tapping threads (coarse threads), machine threads (ordinary threads), drywall screw threads, fiberboard screw threads, etc. In addition, there are also various forms such as single lead (single start), double lead (double start), multiple lead (multi-start), and high-low double-start threads.

Drive styles: Phillips,Slotted,Combination(Phillips/Slot),Six Lobe,Hexagon,Hexagon Washer,Slotted Hexagon Washer,Square,Pozi drive etc.

For carbon steel,to enhance the corrosion resistance and service life of self-tapping screws, their surfaces are usually subjected to electroplating, phosphating, and other treatments.