The SawStop Zero Clearance Throat Plate with replaceable inserts allows you to have a perfect ZCI for every blade in your shop. The durable aluminum insert plate replaces your stock phenolic plate and the replaceable inserts can be quickly swapped for thin kerf, standard kerf, bevel, and even dado cuts. No more replacing the entire expensive stock insert plate, just pick up a 4-pack of inserts and enjoy a perfect ZCI with every cut you make.