.155"(4.0mm) 1 Lb Square String Trimmer line 78 Feet/24 Meters

What It Is

This is a 0.155-inch (4.0mm) square trimmer line, sold as a 1-pound spool with 78 feet (24 meters) of line. It’s designed for heavy-duty trimming on gas-powered string trimmers, brush cutters, and commercial-grade electric units—ideal for thick grass, weeds, and light brush.

Fitment & Compatibility

Before buying, check your trimmer’s recommended line diameter. This 0.155-inch line fits most trimmers that accept 0.155” to 0.160” line (common on brands like Stihl, Echo, Husqvarna, and Ryobi). It will not fit standard 0.080” or 0.095” heads (typical for light-duty electric trimmers). Measure your existing line or check the trimmer head’s max line capacity. This is an aftermarket line, not OEM, but works as a direct replacement for most square-line-compatible bump-feed or fixed-line heads. Ensure your spool can hold 78 feet—some smaller heads may need to cut it in half.

Key Things to Know

• Square shape = better cutting: The square edges cut more aggressively than round line, reducing heat buildup and fraying. Good for heavy use.
• Installation is straightforward: Load as you would any spool line; no special tools needed. Watch for winding direction (usually clockwise).
• Common gotcha: If your trimmer head is designed for 0.130” or thinner line, this 0.155” may jam or not feed properly. Verify your head’s max line diameter before cutting.
• Durability note: This line is stiffer than thinner options, so it wears longer in abrasive conditions but may break if you hit rocks or curbs at high speed.

Should You Buy It

Buy this if you have a gas or heavy-duty electric trimmer that accepts 0.155” line and you’re tackling overgrown grass, weeds, or light brush. Skip it for small electric trimmers or if you prefer a round, more flexible line for edging. Good value for the price at $12.49 for 78 feet.