Hello Jerry – I agree, the SANDVIK cat is very informative and must be very helpful to folk at the front line of manufacturing. However, I am just a cheapskate old make do and mender so having purchased this job lot of tips at a recent car boot sale for 80p
I made a 12mm shanked tool to hold them.
I didn't have to machine a retaining screw as there was one in one of the plastic cases. These tips are meant for finishing but they rip through metal with little effort and give a great finish when I need it. There are 18 SUMITOMO tips in total in the 2 cases and I calculate that I'll never need to buy another tip in my lifetime.
Rik