9" Carbide Tipped Brushcutter - Trimmer Blades 5pk UNIVERSAL FIT. It includes 5 blades W/ reducer gasket from 1" to 20 mm Carbide Tipped Trimmer Brushcutter Blades 9" diameter - 100 Teeth brazed-welded Carbide is estimated to last approx. 10x longer than plain steel More teeth creates more aggregate cutting surfaces for longer lasting durability