It fits HD hero3 only.

1. this circle lanyard is compatible with GoPro Hero 3 camera. 
2. in cnc anodized aluminum, durable for long term use. 
3. These rings are very easy to install. 
(use a philips head screwdriver, remove the six screws, remove the GoPro plastic ring, replace the circle with lanyard, lanyard ring in place screws and tighten. Anyone can install it) 
4. extremely light weight but very strong plastic.

Contents:

1 x blue aluminum lanyard ring assembly

1 x screwdriver