Size used in photo is the S size.
Cutter Base Measurements:
S - 45 x 22.5 mm (1.77 x 0.89 in)
M - 55 x 27.5 mm (2.17 x 1.08 in)
L - 65 x 32.5 mm (2.56 x 1.28 in)
XL - 75 x 37.5 mm (2.95 x 1.48 in)
XXL - 85 x 42.5 mm (3.35 x 1.67 in)
All measurements are taken of the bases' exterior dimensions, rounded off to the nearest decimal.