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ARPs handy thread cleaning chaser taps are designed with correctthread pitch and diameter to clean dirty blind or thru holes. Tapscome in five USS sizes: 1/4, 5/16, 3/8, 7/16 and 1/2, as well asmetric. They are sold individually or in sets.
Please Note: Please note that theseare strictly cleaning taps and are not designed to cut thread. They area handy addition to the tool box of any serious engine builder andan essential aid to preparing any block for final assembly. Dont takea chance on weakening block and cylinder head threads. Use thesehandy thread cleaning chasers whenever possible!