pMARXMAN Carbide Burr, Series 597, 14 in Head Dia, 316 in Length of Cut, Ball Shape SD Head Shape, Aluminum Cut Type, 14 in Shank Dia, Solid Carbide Head, Bright Head Coating, 50000 rpm Maximum, Applicable Materials Aluminum, NonFerrous Metals, Soft Steel, Reinforced Plastics and other Soft Materials, SD1NF Industry Specificationp.