PC Material: This brake handle sprocket cover is made of premium PC material, which is sturdy for long time use. Easy to Install: The installation steps are simple and can be completed within ten minutes, provide a good using experience. High Performance: This brake handle sprocket cover has good performance and stable functions. You can use it with confidence. Well Made: This brake handle sprocket cover is professionally designed and standard size, it will fit your machine perfectly. Product Details: Aperture: Approx. 3.3cm / 1.3in. Applicable models: 4500 5200 5800 chainsaw.