A stripper pad holds the metal down tight to the die during cutting or piercing, preventing the metal from sliding or moving on the die.
A recent consultation job reminded me of the importance of selecting the best method for stripping cutting punches. Bridge strippers, also known as positive or plate strippers, are plates that are solid-mounted to the lower die. They strip or pull the pierced metal from the punch.
The method of using a stripper can be by fixing to the die plate a "fixed stripper", or "semi-fixed stripper" which is movable although it has been.