Grinder Mixer 8215 Art s Way Ag Products Portable Which Hammer Mill Screen Size do I need Choose your optional screens sizes As a result you are able to control the material size of your feed This post will also help you pick the screens best fit for your operation based on either your livestock or material type 26″ HM 26″ HM 26″ HM Screen Size 40 HP 60 HP 120 HP PTO 1/8″ 110 180 180 300 180 300 5/32″ 150 225 250