For DK Weight:

Needle
US 5 / 3.75 mm
US 6 / 4.0 mm
Yarn
Sirdar Crofter DK
How much?
2 skeins = 368.0 yards (336.5m)

Please note that there needs to be two sizes of needles because the bottom of the foot is designed to be thicker. The larger needles account for any gauge differences.