Description Features: Crafted from plastic material, this bicycles tail light mount bracket is extremely durability and can bear outdoor conditions. With its simple structure and included washers and wrenches, this Bicycles tail light bracket can easily installed on your Bicycles seatpost and firmly fixed. This bracket is specifically for use with bicycles circulars seatpost with of 31.6mm, 30.8mm, and 27.2mm. The bicycles tail light mount is small in size, which will occupy much space after installation, so bracket will not hinders your ridings. This bracket can also be used to install for sports camera and other part when the tail lamp is not used. Specifications: Material: Plastic Size: As Show In The Picture Note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color. Package includes: 1set Bicycles Tail Lamp Bracket