
I use this to hold an R8-ER32/ER40 collet for my milling machine. Significantly simplifies changing collets. Because my mill has no stop/brake/spindle lock. I used a wrench to hold the spindle shaft (on top of the mill head) but this caused problems (the spacing between the wrenches is not optimal). Took this wrench and used it on every collet holder I now own. Facilitates replacement of end mills/collets. You can't go wrong with lobster keys made in Japan.

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