The size of an adjustable links weld clamp magnet refers to its width, depth and height. The measurements refer to the adjustable links weld clamp magnets when they are in alignment with the linking bars.

 
         
  Width of two adjustable links weld clamp magnets, 60mm and 127mm   
The width of an adjustable links magnet refers to the length of the two magnets from one end of the device to the other. The width can range from 60mm (2.4") to 127mm (5").
 
        
  Depth of two adjustable links weld clamp magnets, 29mm and 51mm   
The depth refers to how wide the ends of the magnets are. This can range from 29mm (1.1") to 51mm (2").
 
        
  height of an adjustable links weld clamp magnet, 25mm   
The height of an adjustable links weld clamp magnet stays the same at 25mm (1") and refers to the height of the magnet excluding the wing nuts on the top.
 
        
  red adjustable links weld clamp magnet 13 kg magnetic pull   
The magnetic pull of weld clamp magnets ranges from 12 - 13kg

The best size of adjustable links weld clamp magnet is the 60 x 29 x 25mm (2.4 x 1.1 x 1").
 
This is because this size of weld clamp magnet does not differ widely in its magnetic pull in comparison to the larger sizes available. This means it would be able to take up less space but still have the capacity to hold a considerable amount of steel.