(19.05mm) Diameter vacuum cup. BULB-VAC^TM with larger air capacity than HANDI-VAC® is designed to pick up larger parts and to minimize wobble. Overall dimensions are 3.4" (86.4mm) long by 1.46" (37.1mm) wide. Simply squeeze the vacuum bulb, place the soft suction cup to the part to be handled, then relax your squeeze and the part is firmly gripped. A second squeeze releases the part.