For holding cylindrical surfaces with suction on an adjustable base

PART #                  THREAD           HT.         A               B                 
R20-20-SVSC       1/4"-20        3.0"        5.0"         1.88" SQ.  
R20-40-SVSC       1/4"-20        3.0"        5.0"         2.50" SQ.   
R20-50-SVSC       1/4"-20        3.0"        5.0"         3.50" SQ. 

PART #                  THREAD           HT.          A              B                 
R8-20-SVSC             M8           76mm     127mm     48mm SQ. 
R8-40-SVSC             M8           76mm     127mm     64mm SQ. 
R8-50-SVSC             M8           76mm     127mm     89mm SQ.