These pliers will form synclastic shapes like bracelets, hoop earrings and any other form that requires a concave surface. They come in three sizes 3/8", 1/2" and 3/4". The 3/8" will form a deep synclastic form with tight radiuses. The 1/2" does similar with less curve. Note: Anneal your metal.

Double Cylinder Bracelet Bending Pliers 1" 3/8" and 1" 5/8." Two different sized cylinders.

Double Cylinder Bracelet Bending Pliers 1 1/2" x 1 3/4"

Double Cylinder Bracelet Bending Pliers with Two different sized cylinders: 5/8" diameter and 1" diameter.