product description:1. You will receive: 24 pieces of trimmer head blades are included in the package, enough for you to replace in your daily life or to prepare spares, they can meet your various needs2.Material: This replacement poly cutting blade is made of nylon material, not easy to break, you can use it for a long time, or share it with your friends or family.3.Smooth surface design: Our poly-cutting blade has a smooth surface; please be careful when holding it because the edge of the blade is sharp.4. How to use: This nylon trimmer blade is compatible with STIHL and easy to replace, just remove the mower's screwdriver and put on a new blade.5. Round hole: Our trimmer head blade is tightly locked by screws, it is not easy to fall off during use, it can also improve your work efficiency and bring you more convenience.