The width of a through hole magnetic mounting pad refers to the two shortest sides of the magnetic mounting pad and can range from 30mm (1.18″) to 39mm (1.54″).
Depth
The depth of the through hole magnetic mounting pad is the distance between the bottom of the magnet and the top of the back plate. It can range from 7.5mm (0.295″) to 12mm (0.47″).
A thin through hole magnetic mounting pad is better for a car-roof sign as there will be no gaps between the car roof and the car sign.
Length
The length of the through hole magnetic mounting pad can range from 75mm (2.95″) to 100mm (3.9″). A longer magnetic mounting pad will be beneficial for long advertising signs as the magnet will be able to hold a greater proportion of the sign securely.
Through hole diameter
The through holes have a diameter of either 4mm (0.16″) or 5mm (0.2″).
Magnetic pull
The magnetic pull of a through hole magnetic mounting pad ranges from 3kg (6.6lb) to 12kg (24.46″)
A larger through hole magnetic mounting pad will have a greater overall surface area allowing more contact between the magnet and the ferromagnetic material. Therefore, the magnetic mounting pad will be able to hold larger objects more securely.
