High Quality aftermarket piston assembly. 34mm. Fits: Stihl FC75, FC85, FH75, FR85, FS75, FS80, FS85, HL75, HL75K, HT70, HT75, KA85, KR85, KW85, SP81, SP85 Includes: piston, rings, wrist pin, cir clips Replaces OEM part: 4137 030 2010