The Cateye SP12 Rear Flex Tight Bracket allows most current Cateye rear lights to be mounted onto your bike without the need for any tools. This bracket is known to work with the following Cateye rear lights: Cateye Rapid Series (Spacer X Required) Cateye Omni 5 (TL-LD155-R) / TL-LD150-R Cateye Omni 3 (TL-LD125-R) / TL-LD130-R Cateye Solar (SL-LD210-R)