Instrumentum carbonum ferrum (milium ferrum), medium carbonis, ferrum, acine ferrum, immaculatum ferrum et aes, aluminium nuces admixtae.

Ferrum Grade 4.8 circa M5 M6 Auto Parce Rectangulum Quadratum Nut
Diver A2/A4 M6 M8 M10 M12 nativus Stamping Nut
Carbon Steel Grade 6.8/8.8 Zinc Plated Non-vexillum Stamping Rectangulum Duo Hole Nux
Carbon Steel Grade 8.8/10.9/12.9 Blue White Zinc Coated Long Rectangulum Thin Nut
Diver SS201/SS304/SS316 Chamfering Square Nuces
Steel SS201 SS304 Stamping Rectangularis Nucis