SeaSucker 4.5in SeaSucker Mount Black. Thats true because their vacuum cups lend themselves to an almost infinite number of uses. The bottom line is if you need to attach something to a rigid non-porous surface without drilling any holes this is the best way to do it.To make it easier for you to turn the SeaSucker into your solution SeaSucker has slotted holes in the top (for bolting whatever it is youre mounting on there) plus a threaded (1/4-20) stainless insert. The 4.5in SeaSucker vacuum cup is rated to pull up to 120 pounds. All metal parts are high grade stainless steel even the springs inside our pump for extra durability in the elements. Specifications for SeaSucker 4.5in SeaSucker Mount: Manufacturer: SeaSucker Size: One Size Length: 4.5 in Width: 4.5 in Diameter: 4.75 in Package Contents: SeaSucker 4.5in SeaSucker Mount Protective cap included. SeaSucker VM1001B: 4.5in SeaSucker Mount Black