SIBATA 6168-Series Filter Holders are offered with a wide variety of components for different applications. Available with fritted glass support base for general and biological applications, or with removable stainless steel screen support base and PTFE gasket for ultraclean filtrate or proteinaceous solutions. The 300 ml borosilicate glass funnel is graduated from 75 to 300 ml in 25 ml subdivisions. The anodized aluminum clamp features a tension screw to firmly lock the clamp in place.