Tapered Ball Nose End Mill 1/4" X 3" with 0.5mm Tip Diameter(0.25mm Radius) Ball Nose 5.26Deg for CNC Machine Engraving Carving BitsTapered Ball Nose End Mill Tapered angle Ball Nose End Mill Cone Cutters 1 4Inch Shank Diameter, 2 Flutes Ball Raidus: 0. 25mm, Flute Length: 1 1 4 Inch, Overall Length: 3 Inch, Single Side Angel: 5. 2Deg For CNC,Engraving machine. Suitable: Acrylic, MDF, Hardwood, Carbon steel,alloy steel,inconel,stainless steel,titanium alloy etc Suitable Material: 55HRC, Long service life, Decreasing the times of changing cutters,Saving production time