7 Pcs Dual Line String Trimmers Spools Compatible with Greenworks Model 2101602, 2101602A, STBA40B210, BST4000, 0.065" Line Replacement Spool (2900719) and Spool Cap Cover(6 Spools + 1 Cap)

What It Is

This is a 7-piece replacement set of dual-line string trimmer spools (6 spools + 1 cap cover), pre-wound with 0.065-inch line. It’s designed for Greenworks cordless string trimmers, specifically models 2101602, 2101602A, STBA40B210, and BST4000.

Fitment & Compatibility

Before buying, confirm your Greenworks model number matches one of the four listed above. These spools are aftermarket replacements for OEM part 2900719. The 0.065-inch line diameter is thinner than standard 0.080-inch or 0.095-inch lines—check your trimmer’s manual to ensure that’s the recommended size. The spools are specific to Greenworks dual-line bump-feed heads; they won’t fit universal or other brand trimmers. Measure the spool cap diameter (roughly 1.5 inches) to verify it matches your existing cap.

Key Things to Know

• Quality: Pre-wound line saves time, but some users report the line can be slightly brittle or break more easily than OEM. Expect decent performance for light to medium trimming.
• Installation: Easy swap—no tools needed. Push the spool into the head, thread the line through the eyelets, and snap the cap on. Watch a quick video if you’re new to bump-feed heads.
• Gotcha: The cap cover included may not fit all models perfectly; if your original cap is intact, keep it as a backup. Also, the 0.065-inch line is best for light grass and edging—it may struggle with thick weeds or heavy brush.
• Value: At $9.99 for 6 spools (plus a cap), it’s a budget-friendly alternative to buying single OEM spools. However, you’re sacrificing some durability for the price.

Should You Buy It

Buy this if you have a compatible Greenworks trimmer, need a quick and cheap line replacement for routine light trimming, and don’t mind a slightly shorter lifespan per spool. Skip it if you tackle heavy-duty vegetation or prefer the longevity of OEM parts.