The Everyday Belt comes in 4 sizes - Small, Medium, Large and XLarge.

There are 7 holes 1" apart with the centre holes at:
Small 33" (Trouser Size 31")
Medium 36" (Trouser Size 34")
Large 39" (Trouser Size 37")
X Large 43" (Trouser Size 41")

The 7 holes cover 3" in each direction eg: Small 30-36", Medium 33-39", Large 36-42", X Large 41-45"