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ARP M6 x 1.00 Thread Cleaning Tap - arp912-0012 missing-image 7439cc Suspension::Air Compressor Systems 1971-1974ARPs 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