Comparison : Item # D41166480, Long Length HSS 3/16" Shank 4 Flute Double End Mills, USA
Item # D41166520, Long Length HSS 3/16" Shank 4 Flute Double End Mills, USA
Item # D41166540, Long Length HSS 3/16" Shank 4 Flute Double End Mills, USA
Item # D41166560, Long Length HSS 3/16" Shank 4 Flute Double End Mills, USA