Build your own custom engine mounts with ease using the Estes BT5–BT55 Centering Rings. This handy assortment gives you 26 rings in five popular sizes, making it simple to fit engine mount tubes into different body tube diameters. Whether you’re designing your own rockets or modifying existing builds, these centering rings provide the strength and alignment you need.

Perfect for hobbyists of all skill levels, this set ensures you’ll always have the right centering ring on hand. Lightweight yet durable, they’re designed to keep your engine mounts perfectly aligned, giving your rockets stable, consistent flight performance.

• 26 Pieces: A complete set of centering rings for multiple builds
• 5 Popular Sizes: BT5, BT20, BT50, and BT55 to cover a wide range of rockets
• Engine Mount Ready: Perfect for creating custom engine mounts
• Durable Design: Strong cardstock construction for reliable performance
• Versatile Use: Great for scratch builds, repairs, or upgrades