Combines both conical and cylindrical surfaces to effectively reduce tissue and produce a uniform homogenate. Grinding efficiency is greatly improved when this tube is used. This ground glass model is ideal for connective tissue such as muscle, heart, and lung. Construction is strong enough to allow the pestle to be motor driven. Pestles are designed to be used with Stirrer Adapters. Replacement components are available and completely interchangeable. Clearance between pestles and tubes is 0.004" to 0.006". Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements.