They're penetrating

Usage examples of borers.

In many areas they have become one of the most effective, as well as safest, ways to take care of pest problems like cutworms, armyworms, root maggots, borers, Wireworms and cabbage white caterpillars.

She nicked out flat stones to make a deeper well for fat for lamps, and she dried new moss wicks, knapped a new set of knives, scrapers, saws, borers, and axes, searched the seashore for shells to make spoons, ladles, and small dishes.

These borers often attack at a fork and their tunnel entrances are covered with a coating of droppings held together with silk webbing.

Worms, viruses, and Trojan horses would be their gifts to Grandmother, and they would leave explosive blocks, borers, and scramblers to infect the remaining data.

They produce oxygen for the tunnel borers as well as for us, and they also stir the air.

When, excitedly, the crew called for thermal borers and sent them down to investigate, they found buildings!