Two package details, separate jobs
Line profile and diameter answer different questions.
Diameter describes a nominal width. Profile describes the cross-section or shape. Your equipment manual and installed head define which combinations are permitted.
A shaped line is not automatically a compatible upgrade. Do not choose a larger diameter or different profile because it looks more durable or is marketed as quiet or heavy-duty.
| Package detail | What it tells you | What it cannot prove |
|---|---|---|
| Diameter (for example 0.080 in) | Nominal size, often also printed in millimeters. | Whether your exact model and fitted head accept it. |
| Cross-section (round, twisted, square, multi-edge) | Approximate shape of the line strand. | That the profile is approved, feeds correctly, or improves cut quality on your tool. |
| Brand and product family | Manufacturer’s own product name and documentation trail. | Compatibility where no model/head limit is stated. |
Safe comparison steps
- Write down the exact trimmer model, market, and installed head.
- Find the applicable manual or manufacturer product page and copy every approved line diameter/profile statement.
- Compare the package label to that wording. Keep variants separate; do not treat “same diameter” as “same fit.”
- If the source names diameter but not cross-section, do not infer approval of every profile. Ask the manufacturer or head maker.
Round-to-mm conversions
The conversion is mathematical: multiply inches by 25.4 to get millimeters. A package may round the result (0.080 in is about 2.03 mm). That does not account for manufacturing tolerances or non-round shapes, and it does not expand the equipment’s published limit.
The line ledger contains a small source-backed sample, not a complete list of trimmer/head combinations. Manufacturer instructions take precedence over this general comparison.