These spiral bits offer state-of-the-art results in flush trimming. Made from solid carbide, each bit contains up cut and down cut flutes and tipped with a double ball bearing guide. This flute design creates a compression cut that prevents fraying and splintering. Compression spirals will save you time and money on finishing your projects edges by reducing sanding time. Designed for use with: Natural woods, composites, hard plastics, thin aluminum Recommended RPM: 18,000-20,000 (max 24,000) TOOL SPECS: Solid carbide, 2+2 compression, flush trim spiral with 1/4" cutting diameter, 1/4" shank, 1" cutting length, and 3" overall length for use in routers with a 1/4" collet. FLUSH TRIM: Perfect for precise, clean flush trim cuts on both top and bottom in hardwoods, softwoods, laminates, and plywoods for a smooth, professional finish. UP AND DOWN CUT: Designed with up cut and down cut edges, this tool performs like two separate bits, providing the many benefits of both styles in one tool. TEMPLATES: Perfect for following templates, duplicating shapes, and creating intricate designs, especially when using a router table with the template positioned above the workpiece. DOUBLE BEARING: Features double bearings for enhanced stability and reduced strain on the bearings. MACHINES: Compatible with hand routers and router tables, offering flexibility and precision for various woodworking tasks.