Looks cool. Feel the sharpness. No wait, those are razor blades. I've used this brand on a few different projects and this tool is just right for sheet metal (adding downspouts to steel gutters), wood (lots of birdhouses), and plastic (turning 5 gallon buckets into drainage fountains with overflow pipes).Others I bought cheap a long time ago are long outdated.These are probably the last hole saws that I need to buy.