6" Suction / Vacuum Cup with 3/8-16" Threaded Spud Vacuum/Suction cup with 3/8-16" thread stud Capacity Ideal for use in conjunction with ball-heads for light weight video cameras 5/8" spud you can use it as a light stand as pictured on Filmtools' glass front door, or attach a grip head and build car rigs. Spring-balanced pump ensures a consistent vacuum level