Marshalltown Co. was founded in 1890 by brothers Jesse Cyrus Williams and Enoch Lester in Marshalltown, Iowa, to create trowels. The company now also makes tools for work with concrete, drywall, tiling, flooring, masonry, and asphalt. Marshalltown drywall and plastering tools include trowels, ta... Read Moreping knives, texture sprayers, sanders, brushes, compressors, and more. The Marshalltown Drywall Taping Knife has a steel blade and a Durasoft handle for easy maneuvering. This taping knife is 10x3 inches in size for one-handed use. Other Marshalltown concrete tools include cement groovers, trowels, hand edgers, hammers, chisels, and more. The Marshalltown Cement Groover has a steel blade and a mortised wood handle. This groover cuts a 1/2-inch groove.