Durable and reliable material: Made of chrome steel jade, this chainsaw sharpener grinding stone file is built to resist damage and provide lasting performance. Accurate, efficient sharpening: Designed for chainsaws, it also enables precision jade carving workpieces with efficient results. Wide material compatibility: Suitable for various materials including metals (chainsaws, steel), jade, bodhi, wood, and molds. Compatible with electric grinders or lithium electric grinders to suit different projects. Flexible size options: Available in three sizes for precise sharpening according to blade requirements: 4mm, 8mm, and 5.5mm. Practical use scenarios: Restore and sharpen chainsaw teeth to improve cutting performance. Shape and finish jade or bodhi carving pieces with accuracy. Grind and refine metal parts, wooden molds, or steel components using an appropriate electric grinder.