Compatible: Will fit most gasoline lawn mowers. Material: Made from strong carbon steel. Cutting: 9.5" cutting diameter. Design: The trimmer head is specially designed with rounded edges to tackle weeds around the bases of trees and other tricky spaces. Lawn Mower Attachment: Get a weed trimmer attachment head. Use: Get all those hard to reach weeds without breaking your back! Weed Trimmer Head Attachment | Living Social