Compatibility: The spool is approximately 8.3m long and 1.65mm in diameter. The dual line spool compatible with Compatible with Greenworks String Trimmer Models: G40LT, G40LTK2, G40LTK2x, 2101507, 2101507UA, 2101507UC. Please check the model carefully before purchasing to ensure this is the correct fitting you need. 1.65mm diameter: The diameter of the cutting line is 1.65 mm. The length of each trimmer replacement spool is 8.3m long, providing a wide range of trimming. Perfect for the line hole. Easily cuts grass and weeds. Premium Quality: The replacement line spool is made of premium ABS material, the spool is strong enough, the nylon rope is flexible, strong enough for long service life. ease of use. Precaution: When using this product, wear protective goggles and long underwear to avoid injury from wire overflow.