Box Two 1 Inch Integrated Conversion Headset
Box Two™ Integrated headsets feature an aluminum top cap, CNC-machined bearing cover, and split crown race with super-smooth rolling, precision 45x45 bearings.
Good quality, get's the job done
I've used this on 2-3 bikes and it works great. Converts from 1 1/8" head tube to 1" fork steerer.