Rule Steel’s extensive manufacturing facility is located along the Boise River in beautiful Caldwell, ID. Since opening its doors in 1960, Rule Steel has seen steady growth. You can find shop built and field fabricated tanks, seed bins and containers scattered throughout the pacific and inland northwest. Rule Steel’s structural department has enhanced not only Boise’s skyline, but surrounding areas and states as well. Diamond Z industrial wood grinders can be found around the world and continue to be the most innovative on the market. The broad range of products that Rule Steel produces are met with the same quality you have come to expect for over 55 years.