【Compatible with】 Replace STIHL 017 018 021 023 025 MS170 MS180 MS210 MS230 chainsaw. 【Package includes】 Sprocket cover × 1, chain tensioner × 1, nut × 2 and bolt × 2. Parts replacement is quick and easy. 【Effective protection】 The sprocket cover can keep the sprocket clean and protect the sprocket from damage, so that the chainsaw runs smoothly. 【Durable design】Made of sturdy ABS plastic, durable. ABOUT US As a professional supplier, we specialize in high quality replacement parts for most models of chainsaws, grass trimmers, lawn mowers and other power equipment. Our parts strictly conform to OEM standards, the specifications are 100% the same as the original parts. Therefore, you will find the replacement process is quick and easy.