Wiseman Threading Tools Hand Tap - Second Lead Tap - +0.015 Tolerance - M27x3Precision hand tapping redefined: the Wiseman Threading Tools Hand Tap with +0. 015 tolerance is engineered to cut pristine internal threads by hand. This second lead tap design delivers smoother cutting action and steadier chip flow, so you maintain control even in deep, hard to reach bores. Built for accuracy, it helps you achieve consistent thread engagement every time. Key advantages that matter on real world jobs +0. 015 tolerance delivers tight,