Drill square hole on mortise machine

Two methods to use the square hole drill correctly:
1. Drill square holes directly needs a mortise machine or a wood mortising attachment. It doesn't fit for the hand drill o regular drill press directly.
2. Using the twist drill on an electric drill to drill a round hole, then cur the square hole manually with the square drill bush
• Drill square hole dril...
This video is to show how to use the square hole drill on the mortise machine. It's easy to drill square holes and improve the efficiency for wooding-workers. And you can buy the kit in below link:
www.amazon.com...