You know what it looks like… but what is it called?
TAKE THE QUIZ“double cut”
The following 2 entries include the term double cut.
double-cut file
noun: a file with a surface cut into two series of parallel ridges crossing each other usually at less than a right angle, both ridges being diagonal to the center line of the file
double-cut saw
noun: a saw having teeth that cut during both the pushing and pulling strokes
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Merriam-Webster unabridged