AGATE MORTAR & PESTLE SET INNER DIAMETER = 65MM General description Made of natural agate with highly polished surfaces. Excellent for preparing laboratory samples and high purity powders. Material: High Quality natural Brazilian agate (for both mortar and pestle) Hardness: 7.0-7.2 LAB4US Agate Mortar and Pestle ID 65mm Polished Brazilian Agate Internal Diameter 65mm, External Diameter 80mm; Depth 16mm; Hardness 7-7.2Agate 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. Internal diameter: 65 mm (2.56"); external diameter: 80 mm (3”.15) ; inner depth: 16 mm (0.63”); Height: 35mm(1.38”); Pestle Size: 14*24*75mm; Physical dimensions have a stated tolerance of ±3mm; Octagonal mortar is made of naturally hard agate stone; Hardness: 7.0-7.2; Pressure-resistance, Heat-resistance, chemical-resistant; Features highly polished grinding surface for optimal results; A silicone mat is recommended to place under the mortar for the best grinding practice;