SHARP BLADE—It is double sided blade so when one side gets dull and blunt, just turn it over flip the blade to use the other set of edges. Eapele brush cutter blade blows through heavy grass and thick weeds like butter. TOP NOTCH MATERIAL— Eapele brush cutter blades are typically made of carbide-a significantly stronger metal than steel. This durable metal gives it the hardness to deal with any plant that may come its way and give you years and years of service. Fits either 1″ (25.4 mm) or 20 mm arbor.Use with this included silver steel ring,you could attach the blade to 20 mm arbor. Diameter: 10 inches. Thickness: 3.2 mm BRUSH BUSTER—Great for cutting brushwood, bushes, densely grass. Eapele weed eater knife cuts through small saplings, briers, vines and a variety of heavy undergrowth common easily. BE CAREFUL— Highly recommend you wear boots or at least ankle-high shoes and jeans. The pieces of trees and rocks may bounce off of your leg. Safety glasses or goggles are necessary.