N30487 case:o O-RING,0.103" Thk x 1.487" ID, -128, Cl 5, 75 Duro

Niagara Cutter N30487 High Speed Steel (HSS) Square Nose End Mill, Inch, Uncoated (Bright) Finish, Finishing Cut, 30 Degree Helix, 3 Flutes, 6.5" Overall Length, 1.500" Cutting Diameter, 1.250" Shank Diameter
Three flutes provide better chip-carrying capacity than four flutes and a finer finish than two, reducing the need for a second finishing cut in some applications || High-speed steel is compatible with a variety of materials || Uncoated (bright) tools have no additional surface treatment or coating for use on a broad range of materials || Square nose end mills (also called square end) create sharp, unrounded cuts || Center-cutting design allows the end mill to plunge into material like a drill bit while also performing conventional surface milling