This chant makes a weapon or shield stick to its wielder's hand until he voluntarily releases it, making it impossible for the wielder to be disarmed by an opponent or to drop the weapon. Even spells like fumble have no effect against a hero using a weapon protected by the suregrip chant.
The suregrip chant's material components are a scrap of spiderweb from any sort of spider and a thin ribbon of zinc/tin alloy.