The Skull Grasp is a Legendary ring in Diablo III. It requires character level 60 to drop.
As of patch 2.2.0, it gained a unique affix that increases the damage of Whirlwind. This bonus to damage is not multiplicative, and instead of increasing overall damage done by the skill, it boosts the weapon damage, normally increasing it from 340% to 640-740% per tick (700-800% with Volcanic Eruption rune), or +88-117% (+75+100%).
Stats (Level 60)Edit
"Unscrupulous merchants have often duplicated this much sought-after ring to sell to the unwary."
The description may be a reference to the Dupe Bug in the first two games (and early third), which allowed players to copy items for subsequent selling.