For sale is this one KOMET ABS 50 KFK 1-16 INCH MICRO ADJUSTABLE BORING HEAD # M0206201, It has a MODULAR SHANK, size is about 1.101 dia, and it takes about a 5/8 tool, but probably a 16 mm, as the hole size for the tool measures about. Tool pocket looks good and is not wore out nor blown out, and has 2 set screws to hold the tool in solidly.
001 per diameter adjustment for each line, and the lines are far apart so it should be easy to split them for. 0005 per dia adjustments, or even finer as it has a 1/10000 vernier scale on the adjustment dial to get even more precise (see the closeup pic of the dial).
I tested the the bore slide and it works great and turns all the way in and out and is snug and not loose all the way in and out, so it should be very good and ridgid to bore with. The modular shank and locating face are in excellent shape with no pitting from corrosion, but, as you can see the outside has a slight bit of surface corrosion, which will not hurt its performance at all. Please make me a reasonable offer. I hope your job that you are using it on will not be too boring, or maybe it should be boring!