Bon Tools Steel City Finish Trowels set a new standard for concrete and plaster finishers. Among the highest grade finish trowels available, Steel City Trowels by Bon help to get the job done well with its premium blade and lightweight, durable aluminum shank. From the invention of masonry guides over 60 years ago to the launching of our Steel City Finish Trowels this year, Bon is committed to the development and improvement of tools for professional contractors and do-it-yourselfers alike. We put our trusted name to every product we sell.