A reloader never knows when a part might break. Be prepared for anything with high quality factory replacement parts that will have your MEC Shotshell Reloading press loading shotshells like new. Fits MEC 600 Jr. Mark 5, Sizemaster, Steelmaster, 700 Versamec (Pre 1982), Versamec (1982-1985), 600 Jr (Pre 1982), 600 Jr (1982-1985).Specifications and Features: Don t know what part you need to order for your MEC, check your owner s manual.