A novel design offering rapid, efficient grinding with easy operation and reduced effort. In use, the heavy porcelain, grooved pestle sits snugly into the porcelain mortar and is rolled over the sample by rotating the hand whilst applying pressure to the handle head with the palm. The pestle grooves keep the sample under the pestle and the grinding action ensures a finely divided product. Mortar capacity 33ml, and 90mm diameter. Glazed, with unglazed grinding surfaces and polyethylene palm rest. Machine washable. Overall 98 x 98 x 195mm W x D x H. Weight 695g.