CMT 380.050.11 Router Bit for Domino Joining FesTool DF500 5mm RH Solid Carbide Spiral Bits tearout free blind holes exactly tearout free blind holes exactly the surface quality needed for reliable dowel joint strength in cabinet and furniture panels Four cutting edges per insert mean you get four times the use before a knife is retired an efficient choice for shops running high volumes of profiling Premium super strength steel body provides the rigidity and impact resistance needed to maintain dimensional accuracy during repeated plunge and oscillate cutting cycles on the Festool DF500 Micrograin carbide construction in the cutting zone gives this bit the edge retention needed for clean mortise slots in both solid hardwood and demanding wood composites like chipboard