- All-glass construction. - Designed for a motor drive using a stirrer adapter. - Clearance between pestles and tubes is 0.1 to 0.15 mm. - Replacement components are available and completely interchangeable. - All-glass construction. - Designed for a motor drive using a stirrer adapter. - Clearance between pestles and tubes is 0.1 to 0.15 mm. - Replacement components are available and completely interchangeable.