This is a screw on Zaxcom style 3-pin Lemo adaptor for the blank Lav Bullet (not included). This adaptor works with locking and push-pull connectors. The Lav Bullet is an aerodynamic stainless steel weight that can be attached to the connector end of a lavalier, and dropped innocently through clothing using the force of gravity. The Lav Bullet is simple, compact, and easy to use. The blank version is threaded for use with screw on adaptors.