CONSISTS OF A HOLLOW STEEL CYLINDER, CLOSED AT BOTH ENDS, HAVING AN INSIDE DIAMETER OF 700 MM AND INSIDE LINGTH OF 500 MM. THE CYLINDER MOUNTED ON A STURDY FRAME ON BALL BEARINGS. THE OPENING IS CLOSED DUST TIGHT WITH A REMOVABLE BOLTED COVER IN PLACE. A DETACHABLE SHELF WHICH EXTENDS THROUGH THE DRUM CATCHES THE ABRASIVE CHARGE AND DOES NOT ALLOW IT TO FALL ON THE COVER. THE DRUM IS ROTATED AT A SPEED OF 30-33 RPM BY AN ELECTRIC MOTOR THROUGH A HEAVY DUTY REDUCTION GEAR. FITTED WITH REVOLUTION COUNTER AND PUSH BUTTON STARTER. SUPPLIED COMPLETE WITH A TRAY FOR COLLECTION OF THE MATERIAL. ABRASIVE CHARGE CONSISTS OF SET OF 12 NOS. CAST IRON SPHERES OR STEEL SPHERES APPROXIMATELY 48 MM DIAMETER EACH WEIGH BETWEEN 390-445 GRAM. COMPLETE AS ABOVE.