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#zigzag #part alternation mark #sharp line #peaks #rough edge #uneven line

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#metal burr #sharp edge #rough edge #metalworking #machining #debris #filing

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#red burr #metal burr #hot metal #machining burr #red-hot #metal shaving #rough edge

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#jagged edge #uneven cut #torn paper #rough edge #serrated edge #frayed

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#serrated knife #jagged knife #saw edge knife #blade profile #cutting edge #rough edge

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#metal burr #rough edge #sharp metal #deburring #machining