Really clever and smart
Available in two diameter for 22,5-24,0mm and 23-24,7mm. The first is for carbon steerers and also for alumium steeres with high wall thicknesses (like Intend's thick walled steerer on some forks like the Edge and Flash), and the second is for normal alumunium steerer (RockShox, Fox and Intend's normal steerer, ...) and has itself a bigger wallthickness, what makes it perfect for stiffening up your steerer tube below the stemclamp.