Description: Made of quality emery grain, effective grinding effect, fine and even, durable in use. It can be applied to the polishing agent without removing the chain, thereby improving work efficiency. Use with electric sure sharp handheld grinder to easily sharpen your saw chain. Especially designed for sharpening chain saw teeth. Also wide application for metal polishing like chainsaw, jade, wood, mold, steel, etc. Specification: Size: 4.0mm Shank Diameter:3mm; Total Length:46mm/1.81inch Size: 4.8mm Shank Diameter:3mm; Total Length:49mm/1.93inch Size 5.5mm Shank Diameter:3mm; Total Length:45mm//1.77inch Package Includes: 6 Pieces Diamond Chainsaw Sharpener Note: 4.0mm: suitable for small chainsaw chains (3/8) 4.8mm: suitable for small chainsaw chains for 325 5.5mm: suitable for large chainsaw chains for 404 chains