Yep that's what I was and advised and thought about, maybe just easier and quicker to have them broach. Thinking about it it may cause issues using a 4mm end mill to cut titanium, maybe just easier to drill 8mm or so and then just send to be done. Just depends on the cost for doing 100 at a time, will see how the over cut looks first but then still left with the dilemma of the 4mm cutter. Alloy would be no probs and some would be done in alloy, cheers for all your inputs.