A Tool to Gauge How Far to Drill into a Windshield

Question:

Is there a tool to gauge how far to drill into the windshield to make a successful bullseye to stop a crack?

Answer:

We have a spring hammer with a spring-loaded mechanism that takes the guesswork out of creating perfect mini bulls-eyes to terminate the ends of long cracks. Also, it has a drill depth gauge, so you can drill to the perfect depth every time. Lastly, it doubles as a probe for flexing glass or removing loose glass and contaminates.