What thread do you use for thread engraving? What's the difference?

Generally, there are PPDO, PDO and protein lines. We commonly use PPDO lines. In theory, there are only two types: one is toothed, the other is smooth, and the smooth line is divided into: spiral, multiple, long and short, thick and thin, and so on. The reason why so many lines are designed is because each line acts on different parts and can achieve different results.

These lines are essentially different. Most of the protein lines are purified from animal protein, which is sensitive. The PDO and PPDO lines are purely chemical, not raised from animals, but more comprehensive. PPDO is further upgraded on the basis of PDO

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