3507-NES1A  - NES 1A External Thread Restorer suits sizes 4.00-18.00mm (5/32-11/16), up to 7/16" Pipe

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3507-NES2  - NES 2 External Thread Restorer suits sizes 17.00-38.00mm (11/16-1.1/2), 3/8-1.1/8" Pipe

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3507-NES3  - NES 3 External Thread Restorer suits sizes 32.00-152.00mm (1.1/4-6), 1- 5.1/2" Pipe

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