Helical Solutions 83569 | H40ALV-RN-L-30250-BN 0.2500" (1/4) Diameter x 0.2500" (1/4) Shank x 4.5000" (4-1/2) OAL x 0.3750" (3/8) LOC 3 Flute Uncoated Ball End MillHelical Solutions 83569 H40ALV RN L 30250 BN 0. 2500" (1 4) Cutter DIA x 0. 2500" (1 4) Shank DIA x 0. 3750" (3 8) Length of Cut x 4. 5000" (4 1 2) Overall Length x 3. 0000" (3) Reach Carbide 40 Degree Helix Ball End Mill for Aluminum, 3 Flutes, Uncoated (H40ALV RN L 30250 BN). From the Helical Solutions End Mills for Aluminum 3 Flute Ball 40 Degree Helix Variable Pitch Reduced Neck product family.