A heavy duty mount to suit GoPro that you can secure with; bolts, screws or rivets. You can also apply some adhesive tape to the bottom of it.
Use your own bolt and nut. This product and/or service is not affiliated with, endorsed by or in any way associated with GoPro Inc. or its products and services. GoPro, HERO and their respective logos are trademarks or registered trademarks of GoPro, Inc.