Stone Master Molds Fieldstone corner molds are designed to compliment the matching Fieldstone flat stone molds. A corner plug (sold separately) is required for one step corners. These professional quality concrete masonry forms will create irregularly shaped fieldstone corners, also known as flagstones. The finished product/stone is approximately 1-1.75″ thick. Each mold makes approximately 1.5 linear feet if drystacked and 1.75 linear feet with a grout joint. Stone Master’s rubber molds are made from plastisol, which requires no release agent and will last for hundreds of pours. Made in the USA, both materials and labor. Available in 3 unique version, with no stone repeats.