SpeTool 10pcs 12 MM x 12 MM x 2.2 MM Carbide Insert Replacement for Insert Router BitSpetool 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