Construction: Stainless SteelMore than six samples can be processed at onceIdeal for automated systems and high-speed batch filtration with robotsConsiderably reduced contamination risk when working with radioactive biologically hazardous material. Sold Individually. Stainless steel frit is designed for use with WhatmanmL 050/0 Stainless Steel Filter Holder Apparatus for In-Line Filters. 1-Each