DeWalt Cordless Grinder Spanner

Tool to use with a DeWalt cordless grinder (DCG414 in my case). The grinder comes with an Allen Key to open the clamp, which I find a little light on. This tool uses 2 x 6mm Allen Key bits to engage the grinder clamp and get better purchase.

You need:
(2) 6mm by 1/4" Allen Key hex bits