These are Myford collets (VERRRY expensive!). They have the advantage of having no drawbar (being secured by a nut on the mandrel nose) enabling the machining of long workpieces. Arc Euro Trade sell 2 MT collets (for use with a drawbar) in metric or imperial sizes for £6 per collet, which seems to be the cheapest available. I have been happy with the quality of their tools. Cheers! Hubert MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.