Non-standard can be custom,Minimum thickness can be 4MM. Notes: We often change the lables for convenient production! Please do notcare about it! Precautions Electromagnets must meet the following conditions to achieve maximum suction : 1The object to be sucked must have a good magneticpermeability . 2 Proper use of power supply, rated voltage. 3The object to be suckedmust be flat and clean . 4The object to be suckedmust be greater than or equal tothesurface of the magnet ( For example: the magnet is 20*15 mm , so the surface area is S= r = 10 mm sothe object to be suckedmust be greater than or equal to10mm) 5The object to be suckedmust be greater than 8mm .(If thethickness decreases, the suction decreases) 6The object to be suckedmust be close , the middle can't be interspersed with objects or gaps Contrary to any conditions, suction will be reduced, not the maximum suction. Please pay attention when you want to buy. Refused to dispute, at your own risk. If you need other model , please click on the model in the table Model D(mm) D(mm) H(mm) M Power(W) Suction(KG) 10/10 10 4 10 2 1 0.3 Click to buy 13/27 13 5 27 3 1 1 Click to buy 13/30 13 5 30 3 1 1 Click to buy 20/15 20 8 15 4 2 2.5 Click to buy 25/11 25 10 11 4 2 5 Click to buy 25/20 25 12 20 4 2 5 Click to buy 30/22 30 12 22 4 3 10 Click to buy 30/25 30 12 25 4 3 12 Click to buy 34/18 34 16 18 4 3 18 Click to buy 34/25 34 16 25 5 3.5 20 Click to buy 36/38 36 38 5 25 Click to buy 40/20 40 18 20 5 3.5 25 Click to buy 40/25 40 18 25 5 4 30 Click to buy 49/21 49 23 21 6 5 40 Click to buy 50/27 50 23 27 6 6 50 Click to buy 50/30 50 23 30 6 7