Giant Numen Aero tail lights & can be mounted without the need of tools The Giant Numen Aero Tail Light Mount is used for securely fitting Giant Numen Aero Tail Lights to Giant integrated & vector seatpost bike models. It is compatible with all Giant Numen Aero tail lights & can be mounted without the need of tools which makes it quick & easy to put on & take off the lights. Mount to fit ISP & Vector seat posts Compatible with Giant Numen Aero Tail Lights Tool free mounting Description by Mike, Rutland Cycling Web Team.