| Pat.No | Specification/Model | Remarks |
| DY-M-C-P | copper end with gold Plating,and stainless steel case | SPEC:4 backward or 2 backward.2.3 short circuit. |
| DY-M-C-N | copper end with gold Plating,and stainless steel with nickel plating case | |
| DY-M-C-H | Copper plated stainless steel plating 301 hook 5000 cycles |
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