Stainless Steel Basket Beer Keg Dry Hop Filter.  300 micron mesh. (70mm)  2.76″ x (300 mm) 11.81″.  Includes chain for hanging in keg.

Update: Since this post was published the price, availability or promotion has changed.  Check the product page for current description, price and availability.  Also: Today’s Deals on Amazon

UP100 70mmx300mm Dry Hopper Brewing Filter for Cornelius Kegs Corney Kegs Homebrewing Cap With Chain

Also: 5 Recent Hop Finds | Keg Lid with Hang Tab – from William’s Brewing