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