MEC Steel Shot Conversion Kit for Single Stage Shotshell Press 12 and 10 Gauge For MEC 600 Jr, 600 Jr. Mark 5, Versamec and Sizemaster ONLY. Steel shot charge bar not included. Kit will work with 12 gauge loader for 2-3/4" and 3" shells and 10 Gauge presses loading 3-1/2" shel Steel Shot Bottle Steel Shot Drop Tube