This new addition to the Crombie family is specifically built to work with the new external splined lockrings found on the new Shimano mountain bike drivetrains featuring a 9 tooth final cog.
This new Crombie tool features one side for the new nine tooth lockring while keeping the traditional "S Group" Thru Axle tool on the opposite side. This makes it an ideal choice for the modern mountain and gravel minded shop or garage.