11-856-00 GNC Mag -1 Root Feeder is the most durable root feeder on the market. Equipped with a heavy duty 1/2" galvanized extension, 1/4 thick welded metal kick plate, 8 probe and stainless steel tip. The Mag-1 Root Feeder comes standard with stainless steel trigger assembly and valve stem. It's ergonomic grip design provides optimum comfort.