Large Rail Button (fits 1.5 Rail - 1515)

Rail buttons are used in place of launch lugs to guide the rocket off the pad. They are used on BIG rockets, where additional support is needed to prevent the rocket from swaying until the rocket reaches sufficient speed where the fins will guide the rocket. The Large Rail Button is designed for a 1515 rail and rockets approximately 10lbs or larger. 

Switchable rail buttons sizes Rocketry Forum - Model Rocketry Forums

Linear Launch Rail Lugs – LOC Precision / Public Missiles Ltd.

Switchable rail buttons sizes Rocketry Forum - Model Rocketry Forums

G10 Fiberglass CR 75mm/5.5

Large Rail Button (fits 1.5 Rail - 1515)

Inside Track October 2022 by RBD Media - Issuu

1515 S Prairie Ave #713, Chicago, IL 60605, MLS# 11738592

5.5 - 98mm Thrust Plate

Brass Screws