Strong Eye Nut Fixing. Tested SWLSWL T42001: M6 – 100 Kg Tested (Plated) T42101: M8 – 140 Kg Tested (Plated) T42201: M10 – 230 Kg Tested (Plated) T42301: M12 – 340 Kg Tested (Large Eye). An steel eye with female thread.. doughty eye bolt-doughty fixing-trussing fixing