The Avenger F1000 Pump Cup with Baby Swivel Pin (5/8") is ideal for mounting small lights and camera systems onto flat, non-porous surfaces like glass and metal. Pump cups are ideal for rigging car shoots especially when combined with other grip accessories like grip heads and grip arms. Place the pump on the desired surface and pump the blue plunger until you know longer can see the red line. If the red line appears you need to re-pump the pump cup. Capable of holding up to 2 kg/ 4.4 lb the F1000 is a perfect tool when non-traditional surfaces are used for positioning of lighting and grip tools.