You only need to have to position the wire in between the jaws and close. The round jaw will press the wire in the concave resulting in a pleasant half circle loop. Concave pliers also are fantastic for wire wrapping jewellery craft. Totally! There are many solutions and price details https://pliersforhobbyists42715.evawiki.com/9177258/pliers_for_wire_art_things_to_know_before_you_buy