This tool is used to 'finish' your concrete worktop.
 
Test the hardness of your concrete by pressing firmly on the surface. This should leave a slight indentation only. Once the concrete is at this point, it is time to use High Carbon Steel Finishing Trowel with a moderate to firm pressure to smooth the concrete to a slick surface.
Once the finish is satisfactory, let concrete cure for 48 hours before removing forms or sanding.