External BB socket tool for 3/8`socket driver Shop-quality BB/Cassette tool Made of durable forged and hardened chromoly steel CNC-machined finish for accurate tool engagement For use with the CNC Rod, 32mm hex wrench, or 3/8` socket drive wrench Compatible with most major external BB cups External BB Socket 3/8`UPC/EAN/GTIN: 4712805975570