These are ideal for engraving and decorative panel work. Made with Solid Tungsten Carbide inserts, with two flutes. Specifications • Shank Diameter: 8 mm • Dia Metric: 6.3 • Dia Imperial: 1/4 • Cut Length Metric: 12.7 • Cut Length Imperial: 1/2 • Overall Length Metric: 64.5 • Radius 1 Metric: 3.2 • Radius 1 Imperial: 1/8