This CDI box fits many models and makes of ATVs, Dirt Bikes, Go Karts, Scooters, Pit Bikes, and Pocket Bikes. This CDI is commonly used on Jianshe 250cc and Baja 250cc ATVs. Box is also used on the Hensim 250 Utility, Yamoto 250 Utility, older TAOTAO 300cc engines, Roketa ATV-10(RTU-250Y), ATV-12(L6F), ATV-11(RTU-400Y) and many other models from a range of companies. Casing at widest dimensions are L-7cm, W-4.9cm and H-2.8 CDI has one female 4 wire plug and one 3 wire female plug. It is important to note that this CDI module (Ignitor) is occasionally used for some variations of the Baja Wilderness Trail 250 (WD250-U) ATV.