The Calf-Mate calf feeder based on our sturdy N400-8 Fortiflex bucket, modified with heavy duty parts to make a durable and handy feeder for calves. We start with heavy galvanized (#16 gauge) steel bracket, contoured to easily fit a 2" x 4" rail. Rivets are made of aluminum and the handle and eylets are double galvanized steel to keep rust at bay. The bucket is made with our exclusive Fortalloy rubber-polyethylene allow for better cold weather cracking resistance. In short, the Calf Mate calf feeder is one excellent feeding companion for your pampered calves.