Specification Brand : OVERTOYOU BulletPoint1 : Product name: 12V Lithium Battery Grinding Chain Machine BulletPoint2 : Rotating speed: 20000 rpm/min BulletPoint3 : Charging time:4-5 hours BulletPoint4 : Chuck size: 3mm BulletPoint5 : 10 inch Angle grinder and electric chain saw suitable for 3.0mm Color : As Picture Shown ExternallyAssignedProductIdentifier : 6488849303300 IncludedComponents : 1 set of Lithium Battery Grinding Chain Machine ItemName : 12V 2000mAh Grinding Chain Machine Saw Sharpener Chainsaw File Grinder Tools Set ItemPackageDimensions_Height : 6 centimeters ItemPackageDimensions_Length : 30 centimeters ItemPackageDimensions_Width : 16 centimeters ItemTypeKeyword : chain-sharpeners ItemTypeName : Chain Sharpener/File Manufacturer : Sincerity hao Material : Non-Woven Ceramic MaximumCurrent : 2000 milliamps ModelName : Chain Sharpener/File ModelNumber : HH0455 PartNumber : 5AC900778-03 PowerSourceType : Corded Electric ProductDescription : Feature: 12V Lithium Battery Chainsaw Sharpener Kit Handheld Chainsaw Sharpening Kit can fit for most chainsaw blades.Easily maintain your oil chains, gas chains. Fine workmanship and good performance.Easy to use ,Durable in use. Specifications: Product name: 12V Lithium Battery Grinding Chain Machine Size:27.3x5cm Chuck size: 3mm Lithium battery capacity: 2000 mAh Charging time:4-5 hours Working time:40-60 min Power: 55W Rotating speed: 20000 rpm/min Net Weight:0.5kg Speed regulation function: no Packing list: 1 set of Lithium Battery Grinding Chain Machine Note: 1.Included within the pack are three sizes of grinding stones 4mm (5/32'), 4.8mm (3/16'), 5.5mm (7/32'), it Suitable for chainsaws over 12 inches; other specifications of Grinding heads are not included and need to be separate purchased. The reference of select grinding head model is as follows: Electric chain saw 4-8 inch with 2.5mm 10 inch Angle grinder and electric chain saw suitable for 3.0mm 4.0mm for 12 inch chainsaw and 12 inch / 14 inch / 16 inch 325 chain 18 inch / 20 inch suitable for 4.8mm Large 3/8 and 404 chains are suitable for 5.5mm