... centering system. Features:Model TQZ8560 valve seat boring machine is suitable for repairing the valve seat of automobiles, motorcycle, ... machine is set with grinder for cutter and vacuum check device for workpiece.Moden technic, new designAir floating, air ... vacuum clamping, auto-centering, high, positing precisionStraight and V valve seats30°, 45°, 60°and multy-angle cutterCentral operation, quick ...