Piston Ring Set fit STIHL FC55 FC75 FC85 BG45 BG46 BG55 BG65 BG75 BG85 BR45 BT45 After-market PISTON RING SET-Replace STIHL Part Number: #4137 034 3000 Fit STIHL models: BG45, BG75, FC55, FR85, FS45 C , FS55, FS55 T , FS85, HL45, HS75, HS81 T , HS86 T, KM55, KM85, MM55 , SP80, BG46, BG85, FC75, FR85 T , FS45 L , FS55 C , FS75, FS85 R , HL75, HS80, HS81 TC , HT70, KM55 C Fit STIHL models: HS80, HS81 TC , HT70, KM55 C, KM85 R, MM55 C , SP80 K, BG55, BR45 C , FC85, FS38, FS46, FS55 R , FS80, FS85 RX , HL75 K , HS81 R , HS85, HT75, KM55 R, KR85, SH55, SP81 , BG65, BT45, FH75, FS45, FS46 C , FS55 RC , FS80 R , FS85 T , HS45, HS81 RC , HS86 R, KA85 R , KM55 RC , KW85, SH85, SP85, SP85 K Piston Ring Diameter: (34MM), Thickness (1.5MM). This kit consists of 2 (TWO) PCS of Piston rings Estimated Time of Delivery from Singapore: 7-16 working days