Tip Size Inches: .015 Tip Size MM: 0.38 Flute Length Inches: .045 Flute Length MM: 1.14 Length of Reach Inches: .200 Length of Reach MM: 5.08 The Long Reach End Mill tools have a relief grind after the flutes to allow you to continue your cut or plunge without hitting the shaft of the tool. Ball End Mills have a round tip used to machine curved details, also called Ball Nose End Mills, they are used for milling rounded slots, slopes, and machining 2D/3D dimensional contours with a smooth finish. Great for milling into all types of material including, wood, plastic, metal. etc. Made in the USA