Wiseman Threading Tools Bottom Lead Metric HSS Tap Right Hand - M48x1.5Wiseman Threading Tools Bottom Lead Metric HSS Tap Right Hand M48x1. 5 is the workhorse you reach for when you need clean, accurate internal threads in metal. Crafted from high speed steel and ground to tight tolerances, this tap is uncoated for versatile use across a range of alloys and thicknesses. Designed to ISO 529 standards, this tap provides a guaranteed fit with standard metric holes. The right hand thread is the most common in general