Spetool square corners carbide inserts,2.2mm thickness,12mm length, 12mm width, 4-indexable cutting edge, 35° Cutting Angle The blades made of solid tungsten carbide, sharp and durable, smooth cutting work Easy to operate, each blade has 4 sharp edges, 4 times life than the normal router bit Fit for septool spiral/helical planer cutter head system, DIY wood lathe Tools Packed in a plastic container, come with 10 pcs carbide inserts