FISHER SCIENTIFIC JUMBO STIRRER MODEL No. 47. RUNS GREAT, LOOKS LIKE NOT USED MUCH .HAVE HAD THIS IN MY GARAGE FOR ABOUT 20 YEARS IN A CABINET. DON'T REMEMBER WHO GAVE IT TO ME, THOUGHT IT WAS A PAINT STIRRER UNTIL I JUST DUG IT OUT. HAS A 3/8 JACOB CHUCK WITH A KEY. SOME SURFACE RUST FROM TEMPERATURE CHANGE CONDENSATION STILL WORKS.