【Compatible with】STIHL 017, 018, 021, 023, 025, MS170, MS180, MS210, MS230, MS250 series. Keep your chainsaw running like new. 【Package includes】1 x sprocket, 1 x clutch, 1 x sprocket bearing, 1 x worm gear, 1 x washer, 1 x E-clip, 1 x spark plug. Installation and replacement are quick and easy. 【Perfect compatibility】Each replacement part is perfectly compatible with the original. With the high-quality sprocket set, you can easily repair your chainsaw and restore it to peak performance.