Specifications: Diameter (lawn trimmer accessory): 9.4 cm Thickness (lawn trimmer accessory): 5 cm Length (replacement blade): 10.5 cm Thickness (replacement blade): 0.4 cm Color: Black Weight: 383g Package Includes: 1 x Lawn trimmer accessory with 3 blades 20 x Nylon replacement blades Product Description & Details: 1. Our lawn trimmer accessory comes with three high-quality thick nylon blades that are wear-resistant and durable. As blades are consumable items, we also include 20 replacement blades for your convenience. 2. Our lawn trimmer accessory has a diameter of 9.4 cm and a thickness of 5 cm. The replacement blade length is 10.5 cm. The mounting hole diameter is 1.2 cm with a thickness of 0.4 cm. Our nylon replacement blades are securely attached with screws and are not easily detached during use, improving work efficiency and providing greater comfort. 3. Our replacement blades feature a smooth surface and excellent craftsmanship. Handle with care to avoid scratches from the blade edge. (Note: The blade is a small accessory. Keep it out of reach of children to prevent ingestion or injury.) 4. This nylon trimmer blade is compatible with Stihl ST 20-3 and is easy to replace. Simply remove the screw using a screwdriver and install a new blade. Note: 1. The blade is a small accessory. Keep it out of reach of children to prevent ingestion or injury.