10" 40 Teeth Carbide Tip Brush Cutter, Trimmer, Weed Eater Blade UNIVERSAL FIT. It fit either 1" (25.4 mm) or 20 mm arbor Carbide Tipped Trimmer Brushcutter Blades 10" diameter - 40 Tooth brazed-welded Carbide tipped blade is estimated to last about 10 times longer than plain steel Made by CE certified Manufacturer BRUSH & BRAMBLES specialized BLADES. LESS teeth are required to create deeper wider teeth cavities, that can grab & cut more brush material per blade spin