Helical Solutions 82814 | H40ALV-RN-RA-30250-R.015 0.2500" (1/4) Diameter x 0.2500" (1/4) Shank x 0.0150" (1/64) Corner Radius x 3.0000" (3) OAL x 0.3750" (3/8) LOC 3 Flute ZPLUS Coated Corner Radius End MillHelical Solutions 82814 H40ALV RN RA 30250 R. 015 0. 2500" (1 4) Cutter DIA x 0. 2500" (1 4) Shank DIA x 0. 0150" (1 64) Radius x 0. 3750" (3 8) Length of Cut x 3. 0000" (3) Overall Length x 1. 3750" (1 3 8) Reach Carbide 40 Degree Helix Corner Radius End Mill for Aluminum, 3 Flutes, ZPLUS Coated (H40ALV RN RA 30250 R. 015). From the Helical Solutions End Mills for Aluminum 3 Flute Corner Radius 40 Degree Helix Variable Pitch Reduced Neck product