Drilling flat bottom smooth holes doesn't have to be challenging. As a matter of fact, its super easy if you have the right drill bit to do so. If you've never used a forstner bit, this is the perfect set to get you started. If you are an experienced woodworker, then you already know the value of a quality, ideally sized diameter forstner bit set like this one. With seven of the most commonly used drilling diameter forstner bits included, you'll be able to perform a wide variety of flat bottom or through hole drilling applications. Each bit is designed for use with any standard 3/8 inch of ½ inch drill chuck. The bits are milled with a hex shank for maximum torque while drilling. This makes them great for harder wood.