Tiny But Tough. Using the Freefly NATO Rail Clamp in conjunction with the NATO Rail allows you to ad additional accessories to your Ember or Wave camera. As far as external attachment option, you can attach a monitor, light, handle, or magic arm onto your rig or camera. There are ten M3 mounting threads and two 1/4"-20 threads for multiple mounting options, and the clamp is secured using a spring-loaded locking lever.