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• Used to restore damage or worn external threads on bolts, pipes, etc.
• Each thread restoring file will work with 8 different thread sizes
• Convenient 4-piece set
• Color caps on tubes
• Type 1 black cap: Regular bolt; 11-12, 13-14, 16-18, 20-24 TPI
• Type 2 red cap: Ex. Fine/ex. Coarse bolt; 9-10, 12-16, 20-27, 28-32 TPI
• Type 7 green cap: Regular pipe; 8-10, 11 1/2-14, 16-18, 24-27 TPI
• Type 8 blue cap: Metric Bolt; .75-1.0, 1.25-1.5, 1.75-2.0, 2.5-3.0
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