This picture shows a hand jig with a horseshoe handle. After the concrete is grooved, this tool is used to

This picture shows a hand jig with a horseshoe handle. After the concrete is grooved, this tool is used to finish around the edges of the forms. Cut a 10-inch piece of angle iron, heat the ends with a torch, and pinch together to form a canoe shape. Grinding the ends to a sharp edge helps the jig drag through the concrete smoothly.