Tool Reamer 7Mm Gr-2770Precision Reamer for Manganese Bronze Valve GuidesThese reamers have been specifically designed for KPMI Manganese Bronze and Cast Iron valve guides Also, once a reamer is used on Cast Iron, it is not advisable to then use it on a bronze guide Do not attempt to use these reamers to size C630 Nickel Aluminum Bronze guides All cutting diameters are + . 0002"
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