For BT20 tubes - Length 19 mm. for BT5 tubes - Length 25 mm. for BT50 tubes - Length 25 mm. Title: Estes - BT5-BT20-BT50 Tube Couplers. You can build parts of your personal projects cleanly and precisely.
The Estes - BT5-BT20-BT50 Tube Couplers would be ideal for model rocketry users who require high-quality, durable, and reliable couplings for their rockets.
