This compression plug provides an anchor point to set the headset preload on road, MTB, or gravel bikes with carbon forks. It is important to use a compression plug - aka expander plug - in forks with a carbon steerer tube instead of a star nut. Pair this with a Wolf Tooth stem cap for a bit of color. Compatibility Forks with 1 1/8" steerer tubes. Designed for carbon steerer tubes but works with metal steerer tubes Compatible with ID from 23.5mm to 24.5mm steerer tubes Never use a star nut on forks with carbon steerers. Tech Specs Weight: 26gInsertion Depth: 28mmExpansion Bolt Torque Spec: 5-7 Nm