Kessil`s A150W / A350 / A350W /A360 / A360W Gooseneck is a versatile mounting option that allows you to customize the positioning of your light. Designed to be used on most aquariums; glass or acrylic. The Gooseneck is 24 inches long and is malleable but sturdy. The arm provides a strong, adaptable solution to install your Kessil aquarium light. The gooseneck will work with all rimless tanks and rimmed tanks with a rim up to 1-1/8" thick at its thickest portion.