SK Professional Tools was founded in the early 1900s as the Sherman-Klove Company by Mason H. Sherman and Noah Grover Klove. In the early days, we specialized in contract work, producing tools and parts for other companies. After a brief period producing munitions and mortar shell casings during WWI, we returned to our true love and what still drives us today – manufacturing quality tools for the American tradesman. From the original Round-Headed Ratchet to the new SK X-FRAME Ratcheting Wrench, we've been innovating for the American tradesman since day one.