ZUOS is a brand which specialized in all kinds of Vacuum Suction Cup.
The A502 handheld suction cup has a metal handle and brass pump for durability, together with a curved vacuum pad. Perfect for use on flat to concave surfaces, such as glass, windshields, metal sheet, stone slabs, appliances, etc. This glass lifter can be securely attached to a load using just one hand with its convenient thumb pump mechanism. It also makes lifting items easier and safer when working on steps, scaffolding or ladders.

Specifications:
Handle Type: Horizontal
Handle Cup Type: Flat Cup, Diameter: 6" (153mm)
Material: Mental , Rubber
Safe Load Capacity: 70lbs
How to use:
The Plunger uses a red-line indicator to let you know that you have sufficient vacuum to lift your load. Should the red-line appear after pumping, a built-in check valve allows you to re-pump without vacuum loss.
To release, just depress a trigger on the opposite end of the handle from the plunger. A lift tab on pad edge permits instant release. 
Use the cup on clean, relatively smooth, nonporous surfaces, at temperatures from 10°to 120°Fahrenheit. Moisture or contaminants can reduce the slip resistance of the cup. Surfaces should be free of oil, grease or water.
Package Includes:
2 x 6" Vacuum Suction Cup
1 x Carrying Case
1 x Manual Instruction
Maintenance
Always inspect vacuum pads before use. Clean vacuum pads and the load surface between each lift. Make sure both surfaces are dry and free of any dirt or obstruction. Make sure plunger has enough lubrication for pump.
Warranty
This warranty is valid for 12 months. If problems arise due to material defects or improper assembly, it will be replaced free of charge.