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 standards easily. TWO SETS OF INSTALLATION ACCESSARIES—Universally Compatible with Husqvarna, Stihl, Ego, Oregon, and Hitachi trimmer models, which is straight shaft trimmer with 1″ (25.4 mm) or 20 mm arbor. TOP NOTCH MATERIAL— Eapele brush cutter blades are 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. MULCHING ABILITY—10″ diameter length is the best knife blade for mulching. It is much better than The rounder shape, multi-tip knife blades. If sharpness decreases, sharpness can be recovered by regrinding. Warning! —To reduce the risk of injury from thrown objects or broken blades, avoid contact with hard objects such as stones, rocks, or pieces of metal. Always wear hearing protection, goggles, and safety glasses.