Shank / Receiver Diameters Tuba:

American 0,58 inch - 147,3 MM 


SIZE DIAMETER THROAT DEPTH
18 1.29 M Medium-deep
24 1.23 XL Medium
HELLEBERG 1.30 M Deep
18 - standard!
24 - Medium rim, large throat - also a favorite for Sousaphone!
Helleberg - similar to old helleberg!