Feature●This bundle contains 4 different Agate mortars and pestles set with internal diameter 40, 60, 80 & 100mm●Agate mortars and pestles are the ideal tools for grinding a matrix of a solid sample powder in preparation for making a transparent pellet free from spurious absorption peaks. Pure agate is non-absorbing in an infrared spectrophotometer.●Octagonal mortar is made of naturally hard agate stone;●Octagonal mortar is made of naturally hard agate stone;●A silicone mat is recommended to place under the mortar for the best grinding practice.Description Agate Mortar and Pestle Set with 4 Different Dimension Agate Grinder for Lab Grinding Polished Brazilian Agate Internal Diameter 40, 60, 80 & 100mm