Material: The trimmer blades are made of high quality plastic, excellent durability in all weather conditions, high hardness and sharpness, not easy to wear and not easy to break. Strong Durability: For example, when you cut a lawn of about 50 square meters, you only need to replace the plastic blades once or twice, not even the plastic blades. Greatly improves work efficiency. Easy Installation: Easy to install and disassemble, no other tools are required. You can easily install these mower blades on your lawn mower. Uses: When changing the lawn mower head, it is very suitable for garden landscapes, brush cutters and lawn mowers. Change your brushcutter blades regularly to ensure they are performing well and your garden looking healthy. Size: plastic blades about 139mm long, 5mm small hole diameter, 33mm large round diameter. Please compare the hole size with the original size before purchasing.