Abbey Tools Bottom Bracket Socket Chris King/Single SidedConstructed from 7075 aluminum with precise machining Hard green anodized for durability with laser engraved torque recommendations Nice deep finger splines allow for easy usage while hands are greasy Compatible with 3 8 inch square drive ratchet or torque wrench AT 0001 is compatible with all outboard bearing cups that the dual sided model does not fit (AT0002) including Campagnolo, SRAM, FSA and older Shimano models AT0003 is compatible with Shimano