This boring head set comes with an R-8 shank and threads to match your machine drawbar. Included in the set are a set of 9 carbide tipped boring tools of various lengths which allow you to bore holes from as small as 5/8" up to 6" diameter. The boring head has a micrometer dial to set your bore size. The boring head is then locked in place with the included allen wrench. The boring tools are also available as a replacement set under the part # ST 123.
For older machines, the set can be supplied with a Morse # 3 shank and threads to match your drawbar. Just specify in the comments block on your order if you want the Morse # shank.