Vitamix Accelerator/Tamper tool allows for processing thick, dense ingredients that would bring other appliances to a halt. Pushes food down into the Vitamix processing blades but is design not to come in contact with the blade. For use with standard 64 oz. containers – will not work with the 48 oz. containers or the new, low profile 64 oz. containers found on the Pro 300 or Pro 750.