The Estes Regular Engine Mount Kit gives you everything you need to securely install engines in your model rockets. Designed for compatibility with BT-50, BT-55, BT-56, and BT-60 body tubes, this kit offers versatility for a wide range of builds. The included BT-20 (0.74 in. / 19 mm) engine mount tubes make assembly simple and reliable, ensuring smooth performance at launch. Whether you’re working on a new design or replacing a worn mount, this kit provides a straightforward solution with complete instructions included. You can even use it to make a conversion mount for lightweight D-powered rockets, adding extra flexibility to your fleet. Durable and easy to assemble, this kit is a must-have accessory for any rocketeer looking for consistent results. Wide Compatibility: Fits BT-50, BT-55, BT-56, and BT-60 body tubes Secure Engine Mounting: Includes BT-20 (0.74 in. / 19 mm) engine mount tubes Flexible Use: Can be used to create conversion mounts for lightweight D-powered rockets Complete Instructions: Step-by-step guidance makes assembly simple and reliable