MEC is known for making high-quality, long-lasting shotshell presses that work great for beginning shotshell reloaders to the most advanced high-volume shotshell reloader. The Bottle Support for Progressive Shotshell Presses is a heavy duty support that is used to hold bottles steady and eliminate bottle movement while reloading. This support also holds bottle securely when tipping back charge bars or bushings.Specifications and Features:Don't know what part you need to order for your MEC, check your owner's manual. If you do not have an owner s manual you can visit their website: www.mecoutdoors.com and download one.