20 mm (3/4") drive: KM9 - KM10 - KM11 - KM12. Suitable for following grooved nut sizes Type: Socket Set. Thread Repair Kit with Grooved Design for Rust Removal M20-M24/UNF Sizes. 12.5 mm (1/2") drive: KM4 - KM5 - KM6 - KM7 - KM8.
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