8.RMC300 Circular Dense Permanent Magnetic Chuck chinacoal07 we provide service of enterprise's customs declaration, inspection. RMC300 Circular Permanent Magnetic Chuck, Circular Magnetic, Round Permanent Magnetic Chuck Application  It is suitable for holding workpieces for turning on lathe machines and for internal cylindrical grinding machines, and milling machine, etc.  Features  1, All metal top plates-hard wearing brass and steel  2, Extra strong magnetic force and less remaining magnetism  3, While turning magnetic for ON/OFF, the face's accuracy of magnetic force surface doesn't change and can keep high precision processing surface;  4, Coolant and water proof structure  5, Easy to operate handle  6, High performance at a competitive price The permanent-magnetic chuck doesn't need power supply and wil not cause any unexpected accident because of fallure of power supply, therefore, it is being widely used. RMC Series ROUND PERMANENT MAGNETIC CHUCK   Dimension(mm) Weight(kgs) Pole Pitch (mm) Package Packing Quantity   Diamter High Mount Diameter Mount Screw Mount Depth Net Gross Size(mm) Material RMC250 250 50 200 4xM10 3 18 21 0.5+1.5 320x320x120 Plywood 1 RMC300 300 50 230 4xM10 3 28 33 0.5+1.5 370x370x120 Plywood 1 RMC320 320 55 230 4xM10 3 35 42 0.5+1.5 390x390x120 Plywood 1 RMC350 350 55 300 4xM10 3 43 51 0.5+1.5 420x420x120 Plywood 1 RMC400 400 55 300 4xM10 3 52 62 0.5+1.5 470x470x120 Plywood 1