Millipore Analytical Stainless Steel Filter Holders - Kit25 mm, Stainless steel funnel with glass membrane support, 50 mL funnelThe analytical stainless steel filter holders are designed for the vacuum filtration of samples for bacteriological or particulate contamination analysis.This item is a Kit composed of the following items:(Catalog Number - Description)XX1012542 - Millipore Glass Base and Stopper, 25 mm, Stainless Steel Support, Screen ProvidedXX1012503 - Millipore Spring Clamp, 25 mm, AluminumALIGNED25 - Millipore Alignment Guide, 25 mm, 5/PKFeatures & Benefits:. Available in three diameters with four available funnel sizes to accommodate samples up to 250 mL. Holder with 250 mL funnel is equipped with a funnel lid, which can be vented using accessory filter unit. Can be autoclaved or flame-sterilizedApplications:Bacteriological or Particulate Contamination Analysis