This hand-driven 40mL PYREX® tissue grinder is supplied with two pestles to ensure dissociation of cells into fine particles with minimal damage to cell nuclei. Particularly useful in enzyme studies where heat build-up must be avoided. The internal diameter at the bottom of the unground glass tube (mortar) is 0.8475 inch (+/- 0.001 inch). Use the large clearance 'A' pestle for initial reduction of soft tissue. The diameter of the ground and polished end is 0.842 inch (+/- 0.0005 inch) for a nominal clearance of 0.0055 inch with the tube. Complete the homogenization with the small clearance 'B' pestle. The diameter of the ground and polished end is 0.844 inch (+/- 0.0005 inch) for a nominal clearance of 0.0035 inch with the tube. Non-Sterile. Material: Borosilicate Glass Code 7740. Capacity: 40mL. Grinder Style: Dounce. Top Style: Pourout. Mortar Tube Outer Diameter x Length: 27 x 210mm (approximately). Components Included: 2 Pestles. Corning® #: 7722-40.