We probably make the smallest sems that there is-1.6mm diameter with double washers.
Ferrous and nonferrous sems from 14.6mm to 12mm(1/2") diameters.
square thread with ridge for wood, roofing and decking screws
square or hexlobular thread self-drilling screws
410SS SELF-DRILLING SCREWS & STAINLESS CAP SCREWS
Stainless steel high torque sheet metal screws
SCREWS WITH SPECIAL COATINGS