Stone Edge Surfaces Joint Cutting “Box End" concrete carving tool is the perfect tool for decorative concrete or concrete overlay. Stone Edge Surfaces box end joint cutting tool is used for the shaping and cutting of Vertical and Horizontal decorative concrete mixes to get that perfect straight edged and flat bottom look of grout between tiles or to make perfect brick with perfectly straight and flat mortar joints. Lots of other uses for the stone edge surfaces concrete carving tool as well. This is a simple hardened steel hand held concrete carving tool designed to be used on fresh, green, still workable decorative concrete or concrete overlays, to easily carve, scrape and remove excess mix to add realism.