a device for making holes The difference between a borer (used for making tunnels, circular shafts and the like) and a drill is the size of the hole produced Borers take the large range of plus 3-4 feet Because of the size involved, a borer is usually much more complex than a drill
Wood-boring beetles in the larval phase, which burrow into timber for food and shelter, leaving behind wormholes when they emerge as adults e g furniture beetle, longhorn beetle etc Treatment against attack using preservatives usually does not penetrate deeply enough to reach all borers, but they are killed by high temperatures, as in kiln dried timbers