Transform 5/8"-11 female arbor to 3/8" triangle male shank.
Other Items from Adapters Flushcut Blade Mount - Adapter for core bits - 5/8"-11 to 1/4" Shank - Adapter for core bits - 5/8"-11 to 3/8" Triangle Shank - Router Bit Adapter for 1/2" Gas Fitting -