A 1/4" shank is standard on all the below burrs.
A 3/8" shank is available on all burrs over 1/2" diameter.
(Also available in metric sizes.)

A Series - Cylindrical

B Series - Cylindrical End Cut

C Series - Cylindrical Radius Cut

D Series - Ball

E Series - Oval

F Series - Tree Radius End

G Series - Tree Pointed End

H Series - Flame

J Series - 60° Cone

K Series - 90° Cone

L Series - 14° Taper Radius End

M Series - Cone

N Series - Inverted Cone    

Note* - We also manufacture a 1/4" shank burr set.  It is an eight piece set which includes one of each: SA-5, SC-3, SC-5, SD-5, SF-3, SF-5, SG-3, and SL-4.