The Stanley GD50 Ground Rod Driver is ideal for driving rods with proven, hard-hitting technology.The GD50132RF drives 1/2-inch and 5/8-inch rods The lifting eye allows the operator to suspend the driver above the rod with ease. The long side handles give the operator control during the driving process.The in-line valve in the 8-foot hose whips gives the operator On/Off control where he is standing. Both GD50 models have driving anvils which are designed to fit the rods which helps to minimize damage to the rod ends. The anvil which remains in contact with the rod while the hammer in the ground rod driver delivers its high-energy blows to the anvil. The deep socket of the anvil keeps the driver from jumping off the end of the rod.The anvils are interchangeable,so that you can change the capacity of a ground rod driver by simply changing anvils. The removal of two bolts is all that is required to service the front end of the GD50.