The green handled SPA-1 fits adjusting cup on many adjustable type bottom brackets. The pin ends are round with a diameter of 2.9mm. Park Tool Pin Spanners have been designed to give maximum usefulness and versatility at the lowest possible cost. Tough, high carbon tool steel is used on each tool to ensure long life. Handle is vinyl coated to give a good grip. Each Pin Spanner is color coated for easy recognition.