Helical Solutions 19192 | H45AL-RN-L-30312 0.3125" (5/16) Cutter DIA x 0.3125" (5/16) Shank DIA x 0.4375" (7/16) Length of Cut x 6.0000" (6) Overall Length x 3.1250" (3-1/8) Reach Carbide 45° Helix Square End Mill for Aluminum, 3 Flutes, ZPLUS CoatedHelical Solutions 19192 H45AL RN L 30312 0. 3125" (5 16) Cutter DIA x 0. 3125" (5 16) Shank DIA x 0. 4375" (7 16) Length of Cut x 6. 0000" (6) Overall Length x 3. 1250" (3 1 8) Reach Carbide 45 Degree Helix Square End Mill for Aluminum, 3 Flutes, ZPLUS Coated (H45AL RN L 30312). From the Helical Solutions End Mills for Aluminum 3 Flute Square 45 Degree Helix Reduced Neck product family.