Forester Chainsaw Tooth 9" Brush Blade with 3/16" Round File 2 Piece Bundle 2 Piece Bundle Including 1 9" Brush Blade and 1 3/16" (.325" pitch) Round File Warning: Please keep in mind that all safety gear should be used when ripping through brush like crazy The max speed is 10,000 Rpm's and I would recommend our Heavy Duty Leg Protectors and Eye Protection! Sharpening File Included and you will be able to sharpen the teeth with a round file for years of use! This blade is very easy to use on a trimmer with a 1" arbor; The blade has 20 Teeth.