Austenitic Stainless 18-8 or 316, Square drive, Pan Head, Tek Point, #8 / #10. Use for soft or thinner material like aluminum.

Martensite Stainless Steel 410, Square drive, Pan Head, Tek Point, #8 or #10.  Not for use with aluminum.

Austenitic Stainless Steel 18-8 or 316 , Torx(Star) drive, Pan Head, Tek Point, #8, #10.  Use for soft or thinner material like aluminum.

Martensite Stainless Steel 410, Torx / Star drive, Pan Head, Tek Point, #8 or #10. Strong, wear resistant, and mildly chemical resistant. Not for use with aluminum.

Stainless 316(A4), Bugle Head with 4 Ribs, Hex Drive, Type 17 Cutting Point, 14G,Typically Used To Fasten Metal Roofing Or Siding Panels Directly To Wood.

Stainless 304(A2), Bugle Head with 4 Ribs, Hex Drive, Type 17 Cutting Point, 14G,Typically Used To Fasten Metal Roofing Or Siding Panels Directly To Wood.

Sems Screw, Stainless 316 / 18-8, Socket Cap Head,  Flat & Spring Washers, M3/M4

Sems Screw, Nylon Self-locking， Stainless Steel 18-8/316, Torx Pan Head, Flat & Spring Washers, Metric, UNC