Quick align for CNC vice or blank

Slide this alignment tool in one of the T-slots on your milling machine and push a machinist's vice or blank for milling against it's side. Finally clamp or secure the vice or blank in place and slide out the alignment tool. This will give you a quick alignment for 90 degrees to the milling machine's T-slot.

This is for "low tolerance" setups but seems to work very nicely.