This sprocket adapter fits most of the newer bikes that have 8" wheels. Great for converting your mini bike or go-kart to the split sprockets for quick and cheap gear ratio changes. This adapter is precision made on a CNC so it will be a tight fit. Made from 6061-T6 aluminum OD: 5.875" Center Hole: 1.580" Machined Shoulder: 4.562" Outside Hole pattern for sprocket: 5.250" with 1/4-28 threaded holes 4 Hole pattern: 3.150" 3 Hole pattern: 2.200" 6 x 1/4-28 bolts included Will fit the following mini bikes: TrailMaster MB200, BajaWarrior ,MegaMoto B212 ,Coleman CT200U , Coleman CT200UEX ,Coleman BT200. 6 Sprocket Bolts & Nuts Included.