Allows you to convert almost any BT70 based model rocket to quad 18mm cluster flights! Accepts 4 - Estes 18mm "A", "B" and "C" size model rocket engines. Fits in any Estes BT70 size body tube. All FlisKits engine mount kits come with highly detailed instructions and laser accurate, sturdy fiber centering rings to allow for easy construction, super strong mounts and long life. Made in the USA |