<b>Suitable for the thickness of the fish tank</b> ≤0.6inch<br> <b>Product Size</b>：diameter 1.57inch、 height：0.82inch+0.51inch <br> <b>Instructions</b>:When using it for the first time, first place the base of the magnetic brush in the aquarium against the glass, then hold the upper part of the magnetic brush gently near the aquarium.This is not afraid of hitting the fish tank.because the magnetic force is too big.<br><b>After-sales service: Provide you with 12 months of 24/7 customer service. If you have any questions, please contact us directly, we will provide you with a professional solution.</b>