CRL's 4" Single Cup Vacuum Lifters with Release Trigger is generally used for the loading, unloading, stacking, piling, and shifting of sheet products. It protects from cuts on hands and gloves. Production time is increased by the easy application and removal of this cup. Release valve is triggered by a single finger so you can keep a good grip on the cup at all times. The large 4" (102 mm) rubber cup lasts for years if properly taken care of.