Perforating & scoring replacement blades are designed for use with Carl DC-210 12", DC-220 15", DC-238 18" & DC-250 – 25" Heavy-Duty Rotary Series Trimmers. Ideal for creating cards, scrapbook pages, borders, invitations & other craft projects. KM-31 blades cut through paper, film, fabric & felt. Premium steel blades ensure a precise cut. Unique packaging allows you to change or replace blades without ever having to touch the sharp edge.