Review on Bosch HSBAL Standard Two Pin Mandrel by Michael Schafer

This mandrel was purchased for a 4" Bosch HSM400 sheet metal hole saw, the two work great together. I made a project where I had over 50 4" holes in it Had to drill 29 gauge sheet metal. This fix worked flawlessly. I know over $23 is a lot of money for something like this, but it's a prime example of "you get what you pay for".