Features: Made of high quality Acrylic material, Light weight, high transparency, reliable, and not easy to be broken. Can be hung on a fish tank or filter tank to fix the sea source titration pump or the titration hose of any other titration pump brand. There are 4 hole sites in total, which can fix 4 titration hoses, making it stable and improving the efficiency. Maximum thickness for fixing glass : 15 MM, more convenient to use. Long size screw to make sure for clamping the tank well and clamping the doing pump soft tube or air pump soft tube well. Specification: Material: Acrylic Color: Random distribution Scope of Application: fish tank, aquarium Dimensions: 80*55*45mm/3.1*2.2*1.8in (length *width * height) Holder Type: acrylic holder (No screws) Package List: 1 * Fixture Holder 6 * Screws Note: 1. Please allow 1-3cm error due to manual measurement. Thanks for your understanding.