The Mangrove Jack’s Hop Spider keeps hops together during the boil. It can be used on all appropriate sized boil pots, including the Grainfather. Made with a coarser, 800 micron mesh, for maximum wort flow and increased hop utilisation. Diameter: 15 cm , Length: 30 cm . Made from 800 micron 304 grade stainless steel mesh, with stainless steel support band and single hook.