This is a quality non genuine chain tensioning nut and fits the following models 009, 010, 011, 017, 018, 021, 023, 024, 025, 028, 032, 034, 038, MS170, MS180, MS210, MS230, MS240, MS340, MSE140C, MSE160C & MSE200C
Similar to Stihl Part No: 1120 664 1500
MS Part No: 75122
