SGS Series 7 High Performance End Mills Series 7 Speed and Feed Recommendations - Fractional Cutting Diameter Rates shown are a starting recommendation forfinish milling. Some adjustment may be necessary to obtain optimum results. Series 7M Speed and Feed Recommendations - Metric Cast Iron - Gray Cast Iron - Ductile Cast Iron - Malleable Titanium Alloys Cutting Diameter Rates shown are a starting recommendation forfinish milling. Some adjustment may be necessary to obtain optimum results.