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MAC11 3/4X1 THREAD PROTECTOR
this is a thread protector that threads onto a mac11 large thread pattern theres 3 thread classes 1b is loose for 2b is standard thread 3b is a tighter fit and not named 3b
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this is a thread protector that threads onto a mac11 large thread pattern theres 3 thread classes 1b is loose for 2b is standard thread 3b is a tighter fit and not named 3b