Downcut Spiral Router Bits with Solid Carbide for enhanced accuracy Torquata solid carbide spiral bits begin life as extra-hard C4 micro grain carbide, ground using sophisticated 6-Axis C.N.C. to grind their spiral geometry. The precision of the spiral and hardness of carbide allows for a very sharp edge and typically longer edge sharpness. A straight bit can’t compete with that. The geometry and top point allow you to plunge into your work like a drill, using a constant shearing action when making the cuts. Using handheld, downcut bits ejects the waste down with a smoother top edge where plunged. Used in a table, downcut bits eject wastes upward with a smoother bottom edge. Please note that while downcut bits are a preferred option when morticing, signwriting etc. as they leave a finer top edge finish, that because the waste is ejected into the cavity being routed, that the waste can potentially cause the router to lift in operation. Spiral bits work perfectly on all forms of solid timber, along, across and on end-grain and leave razor-sharp edges on melamine, veneered boards, ply, MDF and chipboard. Specifications Shank Size – 1/4in Cutting Diameter – 4mm (5/32in) Cutting Height – 12.7mm (1/2in) Overall Length – 50.8