The Rock Chucker Supreme Press has been one of the most popular single stage reloading presses in the world for many years. The current Supreme model has been lengthened to more easily accommodate some of today's longer cartridges, and the press handle will switch in the mount for right or left handed users. This press has outstanding strength and versatility, and will serve any reloaders needs for many years. Ram diameter is 1 inch, press top thread is 1 and one fourth inch to twelve with a machined 7/8 to fourteen insert, window opening is 4.25 inch.