.155 Inch Heavy Duty String Trimmer Line, 5-Pound Commercial Square Weed Eater Line, 443-ft Spool with Built-in Line Cutter, Tri-Color Weed Wacker Cord

What It Is

This is a 0.155-inch diameter, heavy-duty square string trimmer line on a 443-foot spool, designed for commercial-grade weed whacking, thick brush, and heavy-duty residential use. It’s built for high-speed, high-torque trimmers with bump-feed or reloadable spools.

Fitment & Compatibility

Before buying, confirm your trimmer accepts 0.155-inch line (common for Stihl, Husqvarna, Echo, Ryobi, and Toro commercial models). Check your trimmer’s manual or existing spool for the recommended line diameter—using thicker line can overload smaller motors or damage the spool. The spool has a built-in cutter, so it’s for dual-line bump-feed heads only, not fixed-line heads. Measure your spool’s arbor hole and outer diameter to ensure it fits your trimmer’s head; this spool is a generic aftermarket size, not OEM-specific. If your trimmer uses a proprietary spool (e.g., some Ryobi or Worx models), this won’t fit.

Key Things to Know

• Line thickness: At 0.155 inches, this is thicker than standard residential line (0.080–0.110 inch). It cuts through weeds and light brush faster but may cause premature wear on small trimmers (under 25cc gas or 40V electric).
• Square profile: The square edges act like a blade, improving cutting efficiency and durability, but they can be noisier and produce more vibration than round line.
• Spool loading: The built-in cutter simplifies reloading, but you must still thread the line through the spool’s eyelets correctly—mis-threading causes jams.
• Length: 443 feet is enough for multiple reloads (typically 20–30 feet per trimmer head), so you won’t need to buy again soon.

Should You Buy It

Buy this if you have a heavy-duty gas trimmer (25cc or larger) or a high-voltage electric model and regularly tackle thick weeds, blackberries, or overgrown grass. Skip it if you have a small electric trimmer or prefer lightweight round line for light trimming—this is overkill and may strain your machine.