FeatureFits most garden trimmer, brush cutter, weed eater that takes 1" (25.4mm) or 0.8"(20.0mm)Carbide is reputed to be one of the hardest-strongest alloys, more teeth more long life timeFits for cutting brush and grass and hard weed and shrubSpecificationMaterial: CarbideArbor Bore Size: 25.4mm (1 inch)Blade Diameter: 230mm (9 inch)Attached Washer Size: OutDiameter 25.4mm/1 inch, InsideDiamter: 20.0 mm/0.40 inchPackage Content1x 40 Teeth Carbide Brush Cutter Blade1x washerRemark:1. Please use protective gloves when fitting2. Please refer to the owner’s manual of your trimmer / brush cutter / week eater and our product description to determine whether our blades will fit your tools.3.Please check the rotate direction befroe you start trimmer4.Small notice: 2,3 or 4 teeth metal blade fits for most soft weed or small brush, you needs weed eater saw blade as to big or hard brush, weed and shrub which diameter is more than 0.5"(13mm)5. 2,3 or 4 teeth metal blade's advantage is fast to cut soft weed or grass, yet weed saw blade's advantage is to cut hard weed or brush or shrub