H.S.S., all with 3/4" Weldon Shank Set Consists of Each: 3/4'', 7/8'', 1'' with 4 flutes 1-1/8'', 1-1/4'', 1-1/2'' with 6 flutes 4 Flutes End Mills: These end mills have a cutting diameter ranging from 3/4" to 1", a shank diameter of 3/4", a flute length ranging from 1-5/8" to 1-7/8", and an overall length ranging from 3-7/8" to 4-1/8". 6 Flutes End Mills: These end mills have a cutting diameter ranging from 1-1/8" to 1-1/2", a shank diameter of 3/4", a flute length of 2", and an overall length of 4-1/4". Specialized Multi-Flute Design: Set includes 3/4", 7/8", and 1" diameters with 4 flutes; 1-1/8", 1-1/4", and 1-1/2" diameters with 6 flutes for diverse milling tasks. High-Speed Steel (H.S.S.): Crafted from durable H.S.S. for longevity and resistance to wear, suitable for machining a wide range of materials. Precision Fully Ground: Guarantees sharpness and dimensional accuracy for clean, efficient cuts and reduced burr formation on workpieces. Versatile Compatibility: 3/4" shank size ensures compatibility with Bridgeport and similar milling machines, enhancing tool versatility. Wood Stand Included: Comes with a practical wood stand for organized storage and easy accessibility, keeping your workspace tidy and efficient.