For holding cylindrical surfaces with suction

PART #                 THREAD         DIA.        HT.       
R20-10-VSC        1/4"-20        1.13"         3.0"
R20-15-VSC        1/4"-20        1.13"         3.0"
R20-20-VSC        1/4"-20        1.50"         3.0"
R20-40-VSC        1/4"-20        2.52"         4.0"

PART #                 THREAD       DIA.          HT.        
R8-10-VSC            M8            29mm        76mm
R8-20-VSC            M8            29mm        76mm
R8-40-VSC            M8            64mm      100mm