COPLAR 18-Inch String Trimmer Attachment – 18" Straight-Shaft, 0.08" Line, Fits Attachment-Capable Powerheads

The COPLAR 18-Inch String Trimmer Attachment converts compatible attachment-capable powerheads into a long-reach, 18-inch cutting trimmer for edging and trimming under benches, decks and shrubs.

Designed as a direct-fit accessory for many major brands, this 18" straight-shaft trimmer attachment adds reach and a wide cutting swath to attachment-capable units from manufacturers like Ryobi and Homelite. It uses a 0.08" replacement line and an 8-foot spool length for extended use between reloads. The coupling and drive shaft dimensions were made to match common powerhead interfaces so you can swap attachments quickly and extend the utility of a single powerhead.

How does this attachment increase reach and access in my yard?

The COPLAR attachment has an 18-inch cutting swath and a straight shaft configuration that puts the cutting head farther from the powerhead. That extra length helps you reach beneath raised structures and into tight planting areas without crouching or moving heavy items. The straight shaft keeps maneuvering predictable and lets you work along edges and around obstacles smoothly.

• 18-inch cutting swath for broader coverage per pass
• Straight shaft design for extended, controlled reach
• Ideal for trimming under benches, decks and shrubs

Will this attachment fit my powerhead or brand?

This unit is built for attachment-capable powerheads and lists compatibility with many major brands including Ryobi, Greenworks, Remington, Craftsman, Troy-Bilt and more. The powerhead coupler accepts a 1-inch AL diameter tube. The drive shaft connector is a .205" square female, and the attachment drive shaft measures .200" across flats — verify those dimensions on your powerhead before purchase.

• Compatible with many major brands and attachment-capable models
• Powerhead coupler: 1 inch AL diameter tube
• Drive shaft connector: .205" square female; attachment shaft .200" across flats

What line and spool specs should I expect, and how easy is reloading?

The trimmer uses a 0.08" diameter line with a spool length of 8 feet, offering a balance of durability and cutting performance for general lawn edge work. The head accepts the 0.08" line which is easy to wind and replace, so you can reload quickly on the job. Because of the line size, it's best suited for grass, light weeds and trimming tasks rather than heavy brush.

• Line diameter: 0.08" — durable, easy to load
• Spool length: 8 feet for longer runtime between reloads
• Simple spool replacement process keeps downtime minimal

How does the 18-inch cutting swath affect efficiency and finish?

An 18-inch swath covers more ground per pass than smaller heads, reducing the number of passes needed along borders and open areas. That larger cutting path speeds up trimming around yards and along walkways while helping create a more consistent edge. For confined spaces or very precise decorative edging, you may still prefer a narrower head or manual tools.

• Larger swath lowers trimming time along long edges
• Helps produce uniform edges with fewer passes
• Better for medium-to-large areas; less ideal for ultra-precise edging

Who is this for: The COPLAR 18-Inch String Trimmer Attachment is aimed at homeowners and landscape pros who already own an attachment-capable powerhead and want to expand its functionality with a long-reach trimming solution. It’s a practical upgrade for people who need to reach under structures and across larger swaths without buying a second dedicated trimmer. Confirm your powerhead’s coupler and drive shaft measurements before ordering to ensure proper fit.