iOS 10 compatible Whether you use Metric taps and drills, US Standard taps and inch drills, or any combination of size types, this app has the answers. No typing required; just tap your thread type and spin the dials to find the correct size of drill for your thread tapping operation. Thread types include: US Standard UNC, UNF, UNEF ISO Metric coarse, fine National Pipe Thread - Tapered (NPT) National Pipe Thread - Straight (NPS/NPP) British Pipe Standard Thread - BSP (Parallel - G) British Pipe Standard Tapered Thread - BSPT (Parallel - R / Rp)A helpful reference tool for engineers, machinists, trades-men, students, tool makers, DIYers, fitters and turners, and fabricators, etc.