Comparison : Item # D41155440, 4-Flute HSS Single End Ball End Mills, USA
Item # D41155510, 4-Flute HSS Single End Ball End Mills, USA
Item # D41155540, 4-Flute HSS Single End Ball End Mills, USA
Item # D41155590, 4-Flute HSS Single End Ball End Mills, USA
Item # D41156110, 4-Flute HSS Single End Ball End Mills, USA