Features: <br> <br>Made from acrylic, convenient to clean and durable. <br>Telescopic design for your different needs. <br>With screws, it can be firmly attached to the aquarium or filter tank. <br>The maximum fixing thickness for glass thickness is 1.2cm. <br>Easy to install and take off. <br>Working with small or medium filter bags. <br> <br>Specification: <br>Condition: 100% Brand new <br>Material: Acrylic <br>Size(L*W*H): approx.20.5*12*5.3cm / 8.07*4.72*2.09in <br>Hole diameter: 9.5cm / 3.74in <br>Color: As shows in pictures <br> <br>Package List: <br>1* Prefilter Sock Holder <br> <br>Notice: <br>Please allow 1-2cm error due to manual measurement and make sure you do not mind before ordering. <br>Please understand that colors may exist chromatic aberration as the different placement of pictures.<br>1、Made from acrylic, convenient to clean and durable. <br>2、Telescopic design for your different needs. <br>3、With screws, it can be firmly attached to the aquarium or filter tank. <br>4、The maximum fixing thickness for glass thickness is 1.2cm. <br>5、Working with small or medium filter bags.