1.Suitable for heavy and light grinding. 2.Best for smaller medium and larger workpiece and thin workpiece Feature: 1.Permanent magnetic chuck with Nedymium magnets,strong magnetic force and less remaining magnetism 2.Parrallel fine pole pitch:2 mm(1.5mm of steel+0.5mm of brass) 3.Nominal holding force:100N/cm2 4.Pole plate wearing limit:5mm