.155" Square Trimmer Line (97 ft / 1 lb) - Industrial Weed Wacker String & Weed Eater Line for Fixed-Head Trimmers ONLY - Heavy Brush Cutter Cord - Free Cutter Included | Premium Co-Polymer Nylon, Sharp Cutting Edges, High Durability

What It Is

This .155" square trimmer line is a heavy-duty, industrial-grade replacement string designed for fixed-head trimmers (bump-feed or manual-feed only). It’s built for clearing thick brush, heavy weeds, and overgrown areas, not for light residential trimming.

Fitment & Compatibility

Critical check: This line is only for fixed-head trimmers (no auto-feed, no SpeedFeed, no easy-feed heads). It will not fit bump-feed or automatic heads that require thinner or round line.

Measurements to verify:

• Line diameter: .155" (4.0 mm) – common for heavy-duty gas trimmers (Stihl, Husqvarna, Echo, Ryobi, etc.) but too thick for most electric or battery trimmers. Check your owner’s manual for max line diameter.
• Length: 97 ft per pound – enough for 3–4 full spool refills on most standard heads.
• Shape: Square edges provide extra cutting aggression but wear faster than round line in rocky or abrasive conditions.

Compatibility notes:

• Works with OEM and aftermarket fixed heads that accept .155" line (e.g., Stihl AutoCut 25-2, Husqvarna T35, Echo Speed-Feed 400).
• Not for string-trimming edgers, mini trimmers, or any head that requires pre-cut lengths.

Key Things to Know

• Installation difficulty: Moderate. You’ll need to manually cut and load line into a fixed head (no pre-wound spool). Follow your trimmer’s manual for proper winding direction.
• Durability: Co-polymer nylon with sharp edges cuts aggressively through thick brush, but the square profile can snag on fences or rocks more than round line.
• Free cutter included: A small blade for trimming line to length—useful but not essential.
• Common gotcha: Do not use in a bump-feed head—it will jam or break the mechanism. Verify your head type before buying.

Should You Buy It

Buy this if you have a fixed-head gas trimmer and regularly tackle heavy brush, blackberries, or overgrown weeds. Skip it if you need a general-purpose line for light trimming, or if your trimmer uses a bump-feed or automatic head.