Park Tool BBT-16 Crank Cap Tool The Park Tool BBT-16 Crank Cap Tool removes and installs self-extracting/one key release caps on SRAM and RaceFace cranks with a 16mm hex hole. If you ever find yourself needing a little more leverage, then you're in luck! It provides you with an option to use an 8mm hex key for that extra leverage you need to get the job done. Features investment cast steel construction 8mm hex option for better handling/leverage Manufacturer's Part No: BBT-16 UPC: 763477000798 | Park Tool Bbt-16 Crank Cap Tool Bbt-16 for SRAM and Race Face 16mm Hex