This stainless steel perforated screen is a useful piece of equipment for converting kegs into mash tuns. It has a 1/2" diameter hole in the center for a dip tube (see below for our Stainless Steel Dip Tube). This screen is completely flat, and the perforations are 3/32 holes on 5/32 centers. This is the same screen used in our Weldless Stainless Mash Keg Conversion Kit.