Hawkeye's Bow and Quiver

Hawkeye's Quiver is a specialized quiver made for Hawkeye 's arrows. It is mechanized and can swap arrowheads such as standard, explosive, or grappling hook. Simply by pressing a button on the handle grip of Hawkeye's collapsible bow then a arrow combines with the selected specialized arrowhead.

Thor
Hawkeye uses his Quiver when Thor returned to the S.H.I.E.L.D. compound to retrieve the Mjolnir ; Hawkeye was initally ordered to shoot Thor from the orders from Phil Coulson, however Hawkeye did not end up shooting Thor since Coulson changed his orders

The Avengers
Hawkeye uses his custom quiver for the final battle against the Chitauri and swaps for a grappling hook arrowhead before jumping off a building.