As we all know, collet block come in really handy when we have to hold something in a vise for milling. The most common ones we see here in the US are the 5-C blocks but they have some limitations, namely the limited clamping range of a 5-C collet and the fact that there is a nut in the back of the block. An ER-40 collet block does not have these limitations but they aren't produced by any US maker I know of.
Of course, they have been out for some time in the UK and can be bought from Arc...
Er-40 Collet Blocks From Arc Euro Trade
Of course, they have been out for some time in the UK and can be bought from Arc...
Er-40 Collet Blocks From Arc Euro Trade