This adapter transforms 10mm female thread to 1/2" gas male thread so that the bit can fit on 1/2" gas machines such as Flex routers. The adpater also has center water hole.
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 -