The Rebar Shaker employs a new method of consolidating concrete by using the rebar as the vibrating device. Simply slip over the top of the rebar, fill the cell with grout, and the Shaker vibrates and consolidates the concrete in five to seven seconds. There is no mess to clean up and no human errors, such as skipping cells and poor vibrating techniques, to worry about. Oztec Industries Inc. 800-533-9055.