Rear LED adapter for "D-Shaped" or flat seatposts found on select bicycles from manufacturers such as BMC, Giant and Specialized. Provides a stable, low profile mounting surface for compatible LED lights.Compatible LEDs:Laser Drive RearStrip Drive PRO RearKTV PRO Smart RearStrip Drive Rear STVZOKTV PRO RearKTV Drive Rear STVZOKTV Drive Rear