The YUXI waste tire granulator machine utilizes replaceable knife inserts that are made of through-hardened tool steel. These knives can be reground, repositioned, and reused up to 6 times. The knives can be reground, repositioned, and reused up to 6 times. They provide a knife to knife tolerances of up to one-thousandths of an inch. This allows tire shredders to produce the cleanest cut chips with the least exposed wire.