Almost any general-purpose twist bit will do a decent job of drilling holes in metal. In fact, most drill bits labeled ...

There are three tool options to consider when drilling large-diameter holes in thick steel: twist drill bits, hole saws and annular cutters. 1. Twist drill bits. Especially in steel thicker than ¼", ...

ASTANA, February 4. /TASS/. Initial inspection of the wreckage of the Azerbaijan Airlines (AZAL) plane near Aktau Airport found numerous through holes and metal objects. An examination of these ...