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ARP's Thread Cleaning Chasers are an essential tool in preparing your engine block for final assembly. They come in five sizes (1/4-20, 5/16-18, 3/8-16, 7/16-14, 1/2-13) and are designed with the correct pitch and diameter to clean blind and thru holes.
Note: These are strictly cleaning taps and are NOT designed to cut thread.
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