Note - these knobs do not have a metal thread insert like the Teleflex knobs.These red or black knobs are 1-3/8" in diameter, and have 3/8-24 (fine) female threads bored directly into the hard phenolic plastic body. They fit most Morse controls with 3/8-24 threaded levers.
Note that at 1-3/8" diameter, these Morse knobs are smaller than 1-5/8" Teleflex knobs with the same thread.