Park tool self extracting crank cap tool bbt 16  for removing and installing retaining rings on self extracting and one key release cranks, the self extracting crank cap tool bbt 16 gives great strength and leverage to easily and safely manoeuvre sram and raceface cranks.   solid tool for essential repairs built of investment cast steel for toughness and stability, this park tool device works with cranks with a 16mm hex hole, including truvativ cranks, for simple and efficient loosening and tightening. For those tougher to remove cranks, the tool comes with an 8mm hex hole for extra leverage when turned with an allen or hex key, making the self extracting crank cap tool bbt 16 handy a solid accessory for an essential bit of maintenance. Features   material investment cast steel construction     compatibility 16 mm hex sram, raceface and truvativ cranks  buy park tool accessories from chain reaction cycles, the world's largest online bike store.