Router tip
This is how you want to tighten and loosen router bits. Flip the larger wrench for a smaller space between them when loosening.
1, It keeps you from over-tightening.
2, It allows total control when loosening, even if the collet nut is stuck pretty good.
I always only use the spindle lock for finger tightening while raising the bit a few mm so it just grabs the bit before I use the wrenches.