Review on Diameter Mandrels for Plywood, Drywall, and Plastic by Fernando Beck

I needed something to cut multiple holes of different diameters for a project. The big challenge was cutting a 3 1/2 inch hole 6 times! The boards were made from 3/4" thick hardwood. Cordless drills would stall, need charging and this would take a long time. But after we pulled out a 9 amp drill the holes were done in no time! Because those hole saws were so cheap I kept thinking the bit was going to dull, break or burn before the job was done. Not so! All 6 holes were drilled without breaking the hole saw. Live to see us another day in one to serve another project.These little cutters are worth the money!