All-glass construction
· Popular style which affords the choice of hand or motor operation
· Pestle is tooled for an appropriately sized single-hole rubber stopper (not supplied)
· These grinders can be motor-driven at slow speeds by inserting one end of a short metal rod in the stopper and inserting the other end into the motor chuck
· 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