SIRCHIE®'s No. 617E filter assembly was designed to give optimum performance during the search for microparticle evidence. Constructed of clear, methacrylate plastic in two pieces joined by precision-machined, thread joints, the filter boasts a metal filter support screen which permits unobstructed suction. Tapered aluminum connections permit attachment to any tank and cyclone-type sweepers. Dimensions are: 5.75''x 4.5'' dia.