This stainless steel false bottom is perforated with 3/32 holes on 5/32 centers. The barb is 3/8".

Great for converting 10 gallon beverage coolers, or anything with at least a 12" opening (like a bucket), into an efficient mash tun.  The dome shape leaves minimal dead space for wort to collect, while the barb ensures that you draw from the center of the mash tun to increase efficiency and avoid channeling.