Meanings of huge pincers in English

I can hear the huge pincers scraping bone as it burrows through the soft matter opening into my skull.

The kank simply stood there, docile, its huge pincers opening and closing as it scanned the ground around it for some food.

Would the last thing I ever saw or felt be the huge pincers cutting their way out of my cheek or eye?

From Switzerland to the North Sea the drive went forward, operating as huge pincers cutting like chilled steel through the Hindenburg and the Kriemhild lines.

Did it crawl from his brain to his heart and sink its huge pincers in when he did anything that would release him from Drood?