A reloader never knows when a part might break. Be prepared for anything with these high quality factory replacement parts that will have your Lyman Crusher, Crusher 2, T-Mag, T-Mag 2 Press running like new. Notes: Arm installs in Lyman presses and is spring-loaded to remain out of the ram's slot until held in position.Comes with two priming sleeves for large and small primers.Primer is seated on the down stroke of the ram.