Designed to help improve braking control on frames where disc brakes were not standardThe Box Disc Brake Adapter goes over your hubs axle and mates with the frames dropout, allowing mounting of a standard post mount disc brake caliperAvailable for standard or sliding dropouts with insertsRecommended maximum rider weight 150lbs Compatible with the Box Three Pro disc, Stealth 10mm, and Onyx 10mm disc hubsStandard 10mm Dropouts - Standard dropout configuration, dropout must be between 6-8mm thick, and have a flat inside faceSliding Plate Dropout - Found on many Thrill, Haro, DK and Stay Strong aluminum frames*Please note this product is NOT universally compatible, see boxcomponents.com or your local salesmen for detailsStandard Dropout10mmStandard Post Mount6061ALBlackUPC/EAN/GTIN: 616043831350