Easy to install and easy to use. This is a good retainer for the price and an excellent alternative to the more expensive metal retainers which can cost as much or more than the rocket they are used on. After a few launches of E-G class motors, my first pair are holding up well. My only nit is that it is a bit bulky. On smaller diameter rockets, the closure is larger than the rocket. On one use, I sanded down the ribs to make the model a bit more aerodynamic. I just bought two more packs and plan to use these on all my 29mm motor mounts.

I purchased these after I misplaced the original in the Estes Ventris kit. I can not be more satisfied. These are cheap, and work great. Simply epoxy one end to your motor tube, and you are ready to go. They screw on, and hold your motor tight. I launched my rocket, and these survived a 1,000 feet free fall, keeping the motor in nice and tight. Great product, and is a must have for any rocket, its price, simplicity, and functionality make it such a great product.

These are the best value for a 29mm motor retainer. MUCH lower cost than the metal retainers and work just the same. They are easy to attach and use. After many flights they hold up very well. I highly recommend these! I wish Estes would make these in other sizes.