The rarity of Grievous Grapnel is Rare. At this moment the item is available for trade.
Grievous Grapnel is a skin for Pudge. The skin was added to the game on September 17, 2013, it was created by 7thBattery.
Grievous Grapnel is currently one of the most popular skins, but it is rarely seen in the game due to its high price.