These days, the pliers are made in China, but the handy tool was made at a plant in Dewitt, Nebraska, until 2008. William Petersen, a blacksmith in DeWitt, came up with the idea for locking pliers in the early 1920s. He patented his first wrench in 1921, but the first Vise-Grip wrench with a locking handle was not patented until 1924. Petersen originally sold the pliers from the trunk of his car, but later formed a company and began manufacturing Vise-Grips in DeWitt in 1938. The company was acquired by Irwin Tools in 1993.