60-Pack 4mm Spiral Grass Trimmer Line – 21" Replacement String

NEWONE 60-Pack 4mm Spiral Trimmer Line – Tough, Quiet & Long-Lasting

Keep your lawn looking sharp all season long with the NEWONE 60-Piece 4mm Spiral Trimmer Line. Engineered for heavy-duty grass trimming and brush cutting, this pre-cut replacement string delivers consistent, reliable performance for both homeowners and professional landscapers. With 60 pieces per pack, you'll always have a fresh line ready to go.

Key Features

• 4.0mm (0.157") Diameter: Heavy-gauge thickness for tackling thick grass, weeds, and light brush with ease.
• 21-Inch (53.34cm) Length: Optimal pre-cut length for wide coverage and efficient lawn maintenance.
• Spiral Twist Design: The helical profile maximizes cutting strength and delivers high-performance, consistent trimming results every time.
• Aerodynamic Construction: The spiral shape reduces air drag, cutting down on noise and vibration for a smoother, more comfortable mowing experience.
• 60-Piece Value Pack: Generous supply means fewer stops for replacements — ideal for large yards or professional use.
• Durable Plastic Material: Built to resist wear and breakage even in demanding conditions.
• No Assembly Required: Pre-cut and ready to load straight into your trimmer head.

Specifications

Package Contents

• 60 × Pre-cut 4mm Spiral Trimmer Lines (21" each)

Compatible With

Suitable for most brush cutters and string trimmer heads that accept 4mm diameter replacement lines. Always verify your trimmer's compatibility before installing.

Tips for Best Results

• Soak lines in water for a few minutes before use to improve flexibility and reduce breakage.
• Store unused lines in a cool, dry place away from direct sunlight to preserve elasticity.
• Always wear appropriate protective gear when operating a string trimmer.

For general lawn and garden safety guidelines, visit the U.S. Consumer Product Safety Commission – Lawn & Garden Safety.

For more lawn care tips and outdoor power tool guidance, visit the EPA's resources on outdoor power equipment.

Note: Monitor color may cause slight variation in the appearance of the product. Minor measurement deviations (±1–2%) may occur due to manual measurement.

Frequently Asked Questions

Q: What diameter and length is each spiral trimmer line in this pack?

A: Each trimmer line measures 4.0mm (0.157 inches) in diameter and 21 inches (53.34 cm) in length. The 4mm thickness makes it well-suited for cutting through thick grass, weeds, and light brush without frequent breakage.

Q: How many pieces come in the NEWONE spiral trimmer line pack?

A: You receive 60 pre-cut spiral trimmer lines in each pack, giving you a generous supply for extended use and quick on-the-spot replacements during lawn maintenance sessions.

Q: Will this 4mm spiral trimmer line fit my brush cutter or string trimmer?

A: This line is designed for trimmer heads that accept 4mm diameter replacement lines. We recommend checking your trimmer head's specifications or user manual to confirm compatibility before purchasing.

Q: What makes the spiral twist design better than a standard round trimmer line?

A: The spiral (helical) twist design increases cutting surface area, boosts structural strength, and creates an aerodynamic profile that reduces noise and air resistance — resulting in a quieter, more efficient trimming experience compared to standard round lines.