CARL K-M31 Replacement Scoring/Perforating Set for the DC-210/220/238/2500 Unique packaging enables user to change or replace blades without ever having to touch the sharp edge Blades ensure a precise cut Great for poster board or master-sized paper sheets Perforating/scoring blade set for carl dc-210n/220n/238n Perforating/scoring blade set for carl dc-250