I bought this years ago for jig grinding holes in a couple of dies that was building. I haven't done that kind of work for years and this is just sitting in the cabinet. I hope it finds a good home and becomes useful. I have included the diamond grinding bits of two different diameters and also an extra collet. I have not located the two wrenches for it but you can use any thin open end wrenches to open and close the collet. If I find the wrenches, I will include them when I ship the item. Thanks for stopping by and taking a look.