From the developer: "A utility programme for machinists, CNC programmers or hobbyists for finding basic machining data, such as tap drill size for various thread types, like UN, UN Rollform,Metric threads BSW threads, pipe threads,cutting speeds and feeds for various material types,Use either included database of over 70 materials, or calculate SFM- IPT usinf known RPM - IPM. Right Triangle solutions with Jo Blocks for a 5in sine bar,Calculate Bolt Hole patterns,any number of holes,any start/end angle. Calculate X/Y co-ordinates to drill out the centre, around circumference of a very large hole.Over 30 unit conversions,inch to millimetre,Hp to Kw,Gallons to litres,etc,Calculate weight of a piece of material,15 different materials included.Find the diameter of a bar nedded to machine an N sided regular polygon,Find nearest drill to a given size or decimal of a letter number drill.12 different Data files for materials,weights,drills etc can be edited and customize by the user.Complete context sensative help."