The 390-220 Stens Pre-Cut Aero Trimmer Lines (12-pack) are heavy-duty, molded pre-cut trimmer line segments made for quick swaps and longer wear compared to standard line. Designed for Aero-style heads with a .475" bore, these inserts fit the 385-479 Quick Change Head and also work with Stihl and other trimmer heads that use a .475" mounting bolt. Pop one in, get back to trimming—because re-spooling line is a great way to turn 5 minutes of work into 30.
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