Lil' Bubba helps create continuous decorative concrete borders, walkways, curbs, and other projects. The machine will follow any existing landscape bed design, it can place borders as close as 2 inches from any stationary object, and make turns with a radius as tight as 14 inches. It can form 24-inch walkways, and curb with rebar and wire reinforcement. The Concrete Edge Co. 800-314-9984. 2.