Description: 6 Piece Set: You will get 6pcs chainsaw chain grinding head, which is made of high quality chrome corundum, with strong hardness, not easy to deform, finely polished and meticulously carved. Easy to Use: Can be used in place of a file to keep your chain as sharp as ever, without removing the chain when working. Product Use: mostly used for grinding chainsaw chains, also suitable for jade grinding and polishing. Compatible Models: 220V electric grinder, lithium electric grinder, 12V mini electric grinder. Detailed Parameters: 3x4.0mm: suitable for small chainsaws (3/8 chain); 3x4.8mm: suitable for small chainsaws (325 chains); 3x5.5mm: suitable for large chainsaws (404 chains). Specification: Material:Chrome Corundum Size Chart: 3x4.0mm/0.12x0.16inch 3x4.8mm/0.12x0.19inch 3x5.5mm/0.12x0.22inch Package Includes: 6pcs Chainsaw Chain Grinding Head(4 Pack) Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!