Astro Pneumatic Magnetic Worklight Suction Cup Heavy Duty SLMCUP The Astro Pneumatic Magnetic Worklight Suction Cup Heavy Duty SLMCUP has a heavy-duty suction cup for use with magnetic lights. Finally you can mount your work-light in car interiors on glass, on other non-magnetic surfaces like aluminum hoods and plastic fenders, or on painted surfaces you dont want to scratch. The Astro Pneumatic Magnetic Worklight Suction Cup Heavy Duty SLMCUP has a 32lb pull force rating, steel 2” diameter top plate, and a 2.7” total height.