Mending

Source: Player's Handbook
  Transmutation cantrip
  Casting Time: 1 minute Range: Touch Components: V, S, M (two lodestones) Duration: Instantaneous
  This spell repairs a single break or tear in an object you touch, such as a broken chain link, two halves of a broken key, a torn cloak, or a leaking wineskin. As long as the break or tear is no larger than 1 foot in any dimension, you mend it, leaving no trace of the former damage.
  This spell can physically repair a magic item or construct, but the spell can’t restore magic to such an object.
  Spell Lists. Artificer, Bard, Cleric, Druid, Sorcerer, Wizard