Gimbel Automation Self-Centering Air Vises have two key differences from other solutions on the market: (1) our Self-Centering Air Vises have an all-steel construction, and (2) the moving top of our air vises is fully serrated, enabling the hard jaws with matching serrations to be adjusted to any size in a few seconds. This means that there is no need for you to buy and machine unique soft jaws for each part you manufacture for your first operation. Instead, use the adjustable hard jaws for your first operation and machine second jaws only for second-op workholding as you need them.