Upcut, Eased Edge Profile, Spiral Router Bits - (2 Flute) Solid Carbide - Vortex 3680. 3/4 Cutting Edge Diameter, 1 5/8 Cutting Edge Length, 3/4 Shank Diameter, 4 Overall Length, 1/8 Radius, 1.297 Opening, 1 1/8 Material Thickness. Another Industry First! Not only that, no one has figured out how to duplicate it. The solid carbide, two flute, upcut, double eased profile, bits provide extremely clean finishes in shallow profiles with a maximum depth of 1 1/8. Specially manufactured and designed for the furniture industry. Can be used in all types of wood materials.