A ANLEOLIFE 3-Pound ZT3 Pro Heavy Duty Diamond .155-Inch-by-443-ft Twisted Trimmer Line Spool,3-Component Tri-Extrusion 4.0-mm-by-135-meter Weed Eater String

What It Is

This is a 3-pound spool of heavy-duty .155-inch (4.0 mm) twisted trimmer line, 443 feet (135 meters) long, designed for commercial-grade string trimmers and brush cutters. It uses a three-component tri-extrusion process for durability and cutting performance in thick weeds and light brush.

Fitment & Compatibility

• Line diameter: .155 inches (4.0 mm) – fits trimmer heads designed for 4.0 mm or larger line. Do not use in heads rated for smaller line (e.g., .080–.130 inches) – it can jam or damage the head.
• Spool size: 3-pound spool – intended for bulk loading, not direct replacement for pre-wound spools. You must wind it onto your trimmer’s spool or replace the head with a compatible bump-feed or fixed-line head.
• Brand/model fit: Compatible with any trimmer that accepts .155-inch line, including Echo, Stihl, Husqvarna, Ryobi, and Craftsman. Check your owner’s manual for max line diameter.
• OEM vs aftermarket: Aftermarket – works with most standard trimmer heads, but some OEM heads (e.g., Stihl AutoCut) may require specific winding techniques or line length limits (usually 12–16 feet per load).

Key Things to Know

• Installation difficulty: Moderate – requires winding the spool yourself. Use a line winder tool or follow the head’s manual for even tension to avoid tangles.
• Quality note: 4.3/5 stars from 315 reviews – users report good durability in heavy weeds, but some note it’s slightly stiffer than OEM line, which can cause breakage on rocks or concrete edges.
• Common gotcha: The 3-pound spool is huge – you’ll have many reloads, but the line can dry out or become brittle if stored in direct sunlight or extreme heat. Keep it in a cool, dry place.
• Not for light-duty trimmers: This line is heavy – may overload small electric or low-power gas trimmers (under 25cc) and cause the head to stall or the engine to bog down.

Should You Buy It

Buy this if you run a commercial or heavy-use gas trimmer (30cc+) and need a bulk supply of tough .155-inch line for thick weeds, brambles, or light brush. Skip it if you have a small electric trimmer or only do light grass trimming – you’ll get better results with a thinner, more flexible line.