BOX ONE DISC ADAPTER f/STANDARD-DROP OUT 10mm BLACKDesigned to help improve braking control on frames where disc brakes were not standard The Box Disc Brake Adapter goes over your hubs axle and mates with the frames dropout, allowing mounting of a standard post mount disc brake caliper Available for standard or sliding dropouts with inserts Recommended maximum rider weight 150lbs Compatible with the Box Three Pro disc, Stealth 10mm, and Onyx 10mm disc hubs Standard 10mm Dropouts Standard dropout