For those who are in need of a reliable and high-quality replacement spool for their string trimmer, the TORO Premium .080" Dual Line and Spool 3-Pack (model number 88616) is a great option. This pack is compatible with TORO string trimmer models 51881, 51834, and 51821, and includes three spools in total.

In addition to being compatible with multiple TORO string trimmer models, this spool pack is also easy to install and does not require any assembly. The spools are powered by a 60V battery and come in a sleek black color. With these TORO spools, you can ensure your string trimmer is ready to tackle any outdoor trimming task.