If you've ever watch a glass blower at work then you've almost certainly seen jacks in use.
Jacks are the large tongs that are used to pull at the glass, score lines and much more. Imagine the tweezers that King Kong might need and you've got the idea.
Jacks are to a glassblower what the hammer is to a carpenter. And, like hammers, there a many styles and sizes -- and most glass blowers have an assortment that they use for different tasks.
