Hand Seamers are made from Vice Grips style of pliers with larger jaws than normal. They are used to bend small pieces of metal by hand. I modified the factory-made seamer on the left by adding some soft aluminum pieces to the inside of the jaws so that the seamer won't scratch my aluminum parts. The seamer on the right was made from an old Vice Grips. I removed the hinge pin, ground the jaws smooth, then used a small bolt for a new hinge pin.