- Use to clean threads in spark plug.
ITEM SIZE DRIVE SIZE 1617 M14X1.25/M18X1.5 21 mm 1618 M14X1.25 3/8'' DR./16 mm
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| ITEM | SIZE | DRIVE SIZE |
| 1617 | M14X1.25/M18X1.5 | 21 mm |
| 1618 | M14X1.25 | 3/8'' DR./16 mm |
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