Our dry hop filter has a screw top lid and a hook on the top. This makes it perfect for dry hopping in your fermentor, and it's skinny enough to drop it into your keg. Add some fishing line to pull it back out when you have the perfect hoppiness in your brew! The dimensions are 7cm x 29cm (2.75" x 11.5") which fits most corny style keg openings. We like to use these filters for our steep/whirlpool hop additions in the Unibräu Pro System.