Review on RotoZip GP8 8 Inch Drywall Cutting by Zachary Spaulding

I received these bits and decided to test them on a box where two of the bits broke in half almost immediately. The third bit finally passed the test of the new tool. I don't know how they will hold up in the workplace. I'm not overly optimistic after breaking 2 or them just cut out the cardboard. Maybe they give you 8 bits for 7 bucks because half of them break right away? I'm looking for something better.