Transforms your magnetic stirrer into an orbital shaker or vibrating platform. Platform is magnetically driven; just place it on a magnetic stirrer and it becomes an orbital shaker. (Requires a minimum stirrer top plate of 6"x6") Adjust the speed by setting the magnetic stirrer to the desired orbiting speed. Top and bottom plates have a rubber pad to keep shaker and vessels from "crawling". Platform is 8-7/8" square and 2.1" high.