American standard, Carbide. Provide superior wear resistance and sharp edges for the best finish. Plus Straight flush trim router bit set is an upgrade router kit designed for trimming a veneered surface flush with a substrate or using a template to create multiple identical pieces. Straight flush-trimming bit featuring perfectly balanced for smoother cuts. Fit for all types of wood material, such as MDF, hardwood, softwood, and particle board. Universal 1/4” shank is compatible with all major router instruments, ideal for table mounter router.