Box jaw tongs . These tongs hold flat bars really well .  They are designed to hold material from approximately 1/8 to about 3/8 thick . I set the reigns to be comfortable holding 1/4 thick material . Knife makers like these , because they hold different thickness of steel . 
I currently am making them to hold material sized at :

1 1/2 x 1/4 

1 1/4 x 1/4 

and  1 x 1/4 

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