For sales is one lot 12 pcs HSS split screw adjustable die buttons, with following sizes::

UNC 4-40 
UNC 5-40 
UNC 6-32 
UNC 8-32
UNC 10-24 
UNC 12-24 
UNC 1/4" X 20
UNC 5/16" X 18 
UNC 3/8" X 16 
UNC 7/16" X 14 
UNC 1/2" X 13 
UNC 5/8" X 11 (only this one is 1 1/2" OD type)

Come in either 1"  and  1 1/2" OD split die button 

.