pMorse Carbide Burr, General Purpose Premium, Series 5970, Radius, 14 in Head Dia, 12 in Length of Cut, 2 in Overall Length, Tree Radius Shape SF Head Shape, Standard Cut Type, 18 in Shank Dia, Solid Carbide Head, Bright Head Coating, 45 deg included Angle, 50000 rpm Maximum, Applicable Materials Cast Iron, Ferrous Metals and Steel, SF51 industry Specificationp.