What's included？ 1* Permanent Magnetic Chuck All Accessories for Assembly Details Convenient Magnetic Switch: When you switch ON/OFF, it also ensures that its magnetic surface accuracy remains unchanged, making it convenient for you to use. Brass Panel: The surface of this permanent magnetic sucker is made of superior brass, which makes the disk more resistant to high temperatures. Application This permanent magnetic chuck is suitable for grinding machines, EDMs, line cutting, tapping machines, bench drills, and other processing. Specification Material: Iron, Brass Suction Force: 100N-120N Product Size: 17.5*10*4.5cm/ 6.89*3.94*1.77in Pole Pitch: 1.5+0.5mm/ 0.059+0.019in Parallel Accuracy: Within 0.01mm/ 0.000394in Net Weight: 5.5kg/ 12.13lbs.