This is a seat retention knob that is used on the Phi-Alpha 10, Caleb Coupe and Ethan speedster. he installation and removal of the seat for access to the engine bay (on the Phi-Alpa-10) is much easier than using a bolt. The seats for the Ethan Speedster and the Caleb Coupe also use the seat retention knobs to hold the seat cushions in position. Kit includes four (4) knobs.
