Geometric brand D-1-1/4 item 10565 thread cutting die head for machine shop use. Cuts standard threads from 1/4" to 1-1/4", metric from 13-32mm and pipe threads from 1/4" - 1". This unit was not used much. Has 3/4-10 thread chasers mounted and also comes with a 7/8-9 set. Arbor diameter is 1.5". Great for production work. Geometric was sold out to Landis. Chasers are readily available from numerous mfg's and suppliers. Asking price is a small fraction of what a new one would cost. Travers Tool sells their brand of like sized ones for $2000.