M89B 4/ 4.8/ 5.5mm chainsaw is suitable for chainsaw for polishing Jade glass, etc. Durable Chainsaw Rotary ToolOOTDTY Features: ● High Efficiency: Because there are complete and evenly distributed particles on the tip of the saw, these files can make the chainsaw consistent and efficient. In just a few minutes, annoying sharp edges can be eliminated once and for all.● Durable: The strongest titanium coated diamond grinding wheel we produce has high hardness and is not easy to deform. It uses a titanium plated process, which means that compared with other drill bits that are not coated with titanium, the service life of these drill bits will be extended by 20%.● Easy to Use: These drill bits are specially designed for sharpening electric chainsaws. By the way, these titanium coated files are more difficult in nature, which reduces the number of times they need to be replaced.● Suitable for: chain for polishing chainsaw, jade, jade glass, etc.● Note: the diameter of the electric chainsaw is usually 4mm; The diameter of a small chainsaw is usually 4.8mm. Large chainsaws usually choose a diameter of 5.5mm. Specification: Material: EmeryColor: Gold/SilverSize: Approx. 4/ 4.8/ 5.5mm; 0.15/0.18/0.21 inch Package Included: 12x Chainsaw FileNote: 1. Please allow 1-2mm errors due to manual measurement, please make sure you do not mind before ordering.2. Due to the difference between different monitors, the picture may not reflect the actual color of the item.