HIPA Carburetor with Adjustment Tool for STIHL FS87 FS90 FS100 FS110 HL100 HL90 Trimmer Replacement manufacturer part number: 4180 120 0604 Fits STIHL FS87 FS90 FS100 FS110 string trimmer STIHL HL90 HL100 hedge trimmer Package include: 1 carburetor + 1 adjustment tool Adjustment Tool is designed for Certified Technicians to tune carburetors, and keep engine within EPA specs