Sock

27 to 32 stitches = 4” (10 cm)
20-30 wpi
US 1 to 3
2.25 to 3.25 mm
B–1 to E–4 hook
2.25 to 3.5 mm

These are the most commonly used gauges and needle or hook sizes for specific yarn categories. They're meant to be guidelines only. Read the yarn band for specifics.