Specification Brand : Wilsnsun BulletPoint1 : Part numbers:for compatible with Toro 51954, 51955, 51974, 51975,51976, 51977, 51978, 51988 Gas Trimmers Models(1pcs yellow ) BulletPoint2 : Thread size: M10 x 1.25 LFH, Use 0.095in(2.4mm) trimmer line,12.0orpm max. BulletPoint3 : Replaces OEM Part Number: 308923014, 120950010 BulletPoint4 : Replacement for Homelite: 51954 17", Replacement for Toro: 51974 18in, 51975 18in,Fits 51955 17in Curved-Shaft BulletPoint5 : Unconditional refund and replacement: Please check the size model before ordering,If this product broke or does not meet, please Contact us and send it back for a 100% refund no questions asked,we will reply to you within 24 hours, so that you can get a satisfactory answer. Thank you! BulletPoint6 : Please check the model number. If the model number is incorrect, please let me know which model you need (not applicable)! To avoid returns!Can you let us know that there's something wrong there?Thank you for your valuable feedback! We promptly respond to suppliers. Color : yellow ControllerType : Button Control ControlMethod : touch CuttingWidth : 17.8 inches ExternallyAssignedProductIdentifier : 6910512120582 ExternallyAssignedProductIdentifier1 : 707154831145 ExternallyAssignedProductIdentifier2 : 0707154831145 IncludedComponents : Cord IndoorOutdoorUsage : indoor IsCordless : 1 IsElectric : 1 ItemName : 308923014 Trimmer Head for Compatible with Toro 51954 51955 51975 51978 120950010 Gas Trimmers(yellow ItemPackageDimensions_Height : 19.6088 centimeters ItemPackageDimensions_Length : 9.0932 centimeters ItemPackageDimensions_Width : 16.3068 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : string-trimmer-replacement-parts ItemTypeName : 308923014, 120950010Trimmer Head Manufacturer : Wilsnsun Material : Aluminum MaximumFlowRate : 2.3 gallons_per_minute ModelName : 308923014, 120950010Trimmer Head ModelNumber : 308923014, 120950010 NumberOfBoxes : 5 NumberOfItems : 1 NumberOfPowerLevels : 4 NumberOfSpeeds : 4 PartNumber : 308923014, 120950010 PowerSourceType : ac_dc ProductDescription : Part numbers:for compatible with Toro 51954, 51955, 51974, 51975,51976, 51977, 51978, 51988 Gas Trimmers Models(1pcs) Thread size: M10 x 1.25 LFH, Use 0.095in(2.4mm) trimmer line,12.0orpm max. Replaces OEM Part Number: 308923014, 120950010 Replacement for Homelite: 51954 17", Replacement for Toro: 51974 18in, 51975 18in,Fits 51955 17in Curved-Shaft