Precisely constructed with completely interchangeable parts to allow easier cleaning or replacement of damaged mortars. Ideal for tissue homogenates. Exterior plastic coated glass mortar provides greater safety by protecting the mortar from becoming scratched or checked. The transparent coating allows an unobstructed view of the homogenate during grinding. The Teflon pestle is for soft tissues such as brain or liver. The stainless steel rod is 0.25" (6.3 mm) diameter. The grinding chamber clearance is 0.004" to 0.006' (0.1 to 0.15 mm). Autoclavable and can be used for power homogenization as with overhead stirrer. However, we strongly recommend the use of safety-coated tissue grinder (64793-series) for added safety. This unit is manufactured from Wheaton 33 low extractable borosilicate glass that conforms to USP Type 1 and ASTM E-438 Type 1, Class A requirements.