pMorse Carbide Burr, Premium, Series 5970, 18 in Head Dia, 916 in Length of Cut, 3 in Overall Length, CylindricalNo End Cut Shape SA Head Shape, Double Cut Type, 18 in Shank Dia, Solid Carbide Head, Bright Head Coating, 65000 rpm Maximum, Applicable Materials Brass, Cast Iron and Copper, SA43L3 industry Specificationp.