Avoid the use of this product if you have a pacemaker fitted.
The strong magnetic force is designed so the inner and outer components attach through the aquarium glass. Slide along for cleaning, and rotate to break the grip.
Size Suitable Tank Thickness of Glass
S Width 30 - 50 cm Tank 5 mm
M Width 50 - 80 cm Tank 5 - 8 mm
L Width 80 - 150 cm Tank 8 - 12 mm
XL Width120 - 200 cm Tank 12 - 15 mm