These Saw/Drills are perfect for making pierced carvings and turnings. The special design of these bits allow them to drill holes and then side cut to shape openings in material up to 3/4" thick. The bits are precision made from special super hard Titanium nitride (TiN) coated high speed steel for heat resistance and long life. The set includes one each of 3/32" and 1/8" shank bits that measure 2" and 2-1/4" respectively. They fit in standard 3/32" and 1/8" tool collets like those found in Mastercarver, Foredom, Micro-Pro, Dremel and more.