WarrantyLimited Lifetime Warranty: CMT carbide and carbide-tipped router bits and saw blades are designed, engineered and manufactured to uncomprimising standards for optimum cutting performance and maximum service life. If for any reason you are not satisfied with the performance of your CMT router bits, and the bits were used for their recommended applications, you can return them to CMT for a full replacement. Warranty excludes dull, misused, damaged, and/or resharpened bits.