The Hop Spider contains hops while brewing beer. It's positioned over the edge and extends 18" into your kettle. While boiling, hops can be directly poured into the spider. The basket is 13 3/4" in height with an opening that has a 5 3/4" diameter, tapering down to 3 7/8" at the bottom. It is made of 304 stainless steel with the mesh having an aperture of .2mm, allowing it to catch 99% of the hop material while still allowing hops to move about in the kettle producing great hop efficiency.