Comparison : Item # EN-3, 3/8 EYE NUT-STYLE A, 3/8-16 UNC-2B (ASTM A105) C1030
Item # EN-5, 1/2 EYE NUT-STYLE A, 1/2-13 UNC-2B (ASTM A105) C1030
Item # EN-7, 5/8 EYE NUT, STYLE A, 5/8-11 UNC-2B (ASTM A105) C1030
Item # EN-8, 3/4 EYE NUT, STYLE A, 3/4-10 UNC-2B (ASTM A105) C1030
Item # EN-3-ZN, 3/8 EYENUT, STYLE A, 3/8-16 UNC-2B (ASTM A105), ZINC PLATE C1030