Twelve-piece diamond chainsaw sharpener grinder bits for Dremel tools, designed for professional precision chain grinding. The sharpening head is easy to install and features good heat dissipation. It can be applied without removing the chain, improving work efficiency. These bits are ideal for sharpening chain saw teeth. The titanium-plated diamond wheels offer an extended lifetime. They leave an excellent cutting edge on saw chain and are easily replaced on most electric chain sharpeners. Use with a handheld grinder to easily sharpen your saw chain. Material: Titanium coated emery grains. Size: 4.0mm, 4.8mm, 5.5mm. Shank: 3mm. Applies to: Metal polishing, such as electric saws, jade, wood, molds, and steel. Package Included: 12PCS Diamond Chainsaw Sharpener. Condition: New. Origin: China.