Freud 420mm Medium to Thick Aluminum & Non Ferrous Blades with or without Mechanical Clamping Teeth: 96, Arbor: 30mm Simpson Strong Tie Correct rotation for LH spindle Correct rotation for LH spindle stations multi spindle boring machines require matched left hand and right hand drills for their respective spindle positions The Simpson 4x6 Column Base CB64HDG Hot Dip Galvanized Post Base by Simpson is a heavy duty structural connector engineered to create reliable Purpose built for medium to thick non ferrous materials this blade is specifically designed to cut drawn products and tubes whose thickness exceeds 5mm Coating helps prevent buildup on the blade surface and keeps the blade running cooler and cleaner during extended cutting sessions a meaningful advantage when working with metals that tend to generate heat and residue