This seatpost adapter kit includes D-Shape and Aero adapters plus two ultra-durable mounting straps for the Lezyne Strip Drive and Lezyne Radar Drive LED rear bike lights. Built for modern seatposts. FEATURES: Two adapters: D-Shape seatpost and Aero seatpost Two super durable, highly versatile mounting straps for Lezyne Strip Drive and Radar Drive LED rear bike lights Flexible, versatile strap design adapts to a variety of seatpost shapes and sizes Constructed from industrial strength materials