Alpha chem is manufactures,exporter & suppliers vortex shaker. A) compact, rugged construction b) heavy metal base & rubber feet prevents movement of the shaker during use c) choice of continues & touch mode d) variable speed control e) maximum speed 3000 rpm f) include one hand insert, micro tube insert & cup attachment workable: on 220 v ac 50 hz single phase optional at extra cost :- spare cup attachment spare one hand attachment spare one hand insert spare micro tube insert