The Mendo Mulcher Press is a pollen press made of a durable aircraft grade billet aluminum. This strong design will strongly resist wear and tear and even stop your press from getting covered in finger prints or smudges. At the top and bottom of the press are 1.75 inch knobs with grips to help you screw the press into place. On the inside of the middle stem are two 0.75 inch pins as well. Just like the Mendo Mulcher grinders, this press also comes with a lifetime warranty.