This one-way start clutch bearing is designed for use with various ATV models.It features hardened and ground rollers for improved performance and power transfer.The bearing is constructed from forged steel, heat treated for strength, and comes fully assembled with sprague rollers.The set includes 20 pieces.Suitable for models including TRX400EX, TRX400X, TRX500FA, TRX500FE, TRX500FM, TRX500FPE, TRX500FPM, CBR600, XR400, CB1300, CBR929, CBR954, X11, and GL1500.