Constructed of 316 stainless steel, the KannaMill: Food Grade has been built to meet NSF/ANSI Std. 51 Food Grade standards. With our food grade model, all parts of the mill that come in contact with your product are in compliance. This includes the infeed, discharge chute, rotor & hammers and mill housing, all of which will be welded and polished to NSF/ANSI Std. 51.