This was a custom design so the exact specs are not available. It is solid carbide and the max cutting diameter is 1/2". The pilot appears to be 15/64" but my measurements could be off +/- a small amount. The shank is also 1/2" in diameter. The overall length is about 3-17/32". The length of the pilot is about 5/16". The label on the holder is "Chief Butt Hinge" but according to the maker that's just a name given by the customer.