Magswitch MagMount 235 5 Inch I would go with a

I would go with a dedicated blade for those

A WHOLE LOT MORE

begin with a shallow initial pass and make subsequent deeper passes

This bit features a super-strength steel body

Magswitch MagMount 235 5 Inch I would go with aThe Magswitch magnetic mount allows for easy movement and placing of a tool. With a single on and off lever, you have 216 pounds of magnetic hold force at your disposal. The top of the tool is ready for mounting a variety of accessories. FEATURES & BENEFITS Magnetic field turns completely on and off mechanically. Does not use an electrical power source. Magnet stays clean. Holds flat and round surfaces of steel. Fixed bar magnet is for flat steel.