I got a set like that for home and for the center, from someone here on the board...don't remember who, sorry. I got 2.5 inch, 4 inch and 12 inch for home and a 12 inch for the center. They have removable stems that the bars screw on to. I got stems to fit both my home lathes and the crossbars fit both stems. I like the 12" for the center so my blind students don't fall off the end of the rest, so I am using them on the little jets. Many of my turners are now "hands free" and I only have to help them "hands on occasionally." The longer rests keep them from dropping off the end of the rest when turning something longer than a pen blank. (I do have to put their sandpaper in correct order though.)