Adjustable seat post? No space on the seat post? The seat brace holder lets you mount your red light directly under the saddle. Seat brace holder. You simply click the red light into the holder from below. The seat brace holder ensures a secure and tidy attachment in any situation. With just one touch of a button, you release the red light from the holder to charge it or protect it from theft when you turn off your bike. The tool is only required for the first time assembly. Box contents: 1 Lupine seat brace holder, 1 small Allen key, 1 screwdriver