It has good grinding effect , hard and not easy to wear They are high hardness , wear resistance , strong toughness , resistance Suitable for metal polishing , woodworking Available in 3 different sizes for Chainsaws ( 5 / 32 " / 4.0mm ) , Small Chainsaws ( 3 / 16 " / 4.8mm ) and Large Chainsaws ( 7 / 32 " / 5.5mm ) , they can meet your daily needs Chainsaw Sharpener Size : 5 / 32inch / 4.0mm ; 3 / 16inch / 4.8mm ; 7 / 32inch / 5.5mm ; ( Optional, Manufacturer: Watreketal