The SD Step Down Headset 1-1/8 Inch to 1 Inch headset fits frames with 1 1/8″ head tube and allows you to use a 1″ fork. It utilises precision sealed bearings and comes with subtle SD logos Perfect headset to let you use one inch BOX carbon forks with your Meybo Holeshot frame, or other race frame that has a 1-1/8th head tube.