Chicago-Latrobe catalogue includes countersink, jobber length, reduced shank, extra-long, screw-machine length, taper length, solid spade and straight flute drill bits. The brand's jobber length drill bits are used with both rotary and impact screwdrivers in various drilling applications. They have longer lengths than diameters, which increases cutting speed and heat resistance. Chicago-Latrobe combined drill / countersunk sets are used for drilling and countersinking screws in steel & other ferrous materials. These high-speed-steel-made sets with right-hand cutting direction are available in sets ranging from 5 to 8 pieces.