Clear Brush in No Time! Whether you're clearing shrubby weeds or cutting down invasive saplings, these blades will keep on cutting without slowing down. Star-shaped trimmer blades, especially the three-bladed models are the best knife-type trimmer blades in terms of cutting ability, endurance, and durability. These blades can cut 1-inch twigs to young trees without much effort. With thicker shrubs and trees, you'll need to ease the blade slowly and it will do the job like no other trimmer blade can! Brush Blades That Stay Sharp for Longer Not only do these blades cut like butter, but they also cut more efficiently, ensuring the longevity of the blades' sharpness. Made from fine-grade carbon steel, these blades exhibited high toughness and durability that make them suitable for heavy-duty and rough work without bending, chipping, or dulling. A Note on Compatibility Not all brands and designs of straight shaft trimmers accept this type of blade. Even with the right-size arbor, these blades may still not work on your trimmer two main reasons including: The trimmer head is not removable and/or its design won't allow the mounting of non-standard blades, adapters or accessories. Please take note, that these blades may need additional adapters to mount securely on your specific weed eater model. You have an electric trimmer. These types of trimmers and weed whackers may not have sufficient torque to effectively and safely operate with this type of brush blade. These blades may not fit all models of the brush trimmer brands mentioned above. As this is an aftermarket product, the specifications are based on existing OEM products. You can be assured that these blades has the standard dimensions. In compatible accessories can cause stress, wear, and unnecessary vibrations that can eventually cause machine failure. It's best to double-check compatibility before purchasing.