Park's Cone Wrenches are made of durable tool steel and are nice and thin to fit on the small-clearance cones found on hubs and other bearing assemblies. Plus, they work as regular wrenches, too. They feature Park's special Y heads that put more material where it's needed for excellent durability and strength. This 23mm size fits Shimano 15mm through-axle hubs. Some applications require at least 2 cone wrenches. If you have questions please contact us and we can recommend the correct sizes for your needs.