The ⅛” polished O-flute bit is a great go-to bit for making shallow cuts in a wide variety of acrylics and non-ferrous metals. The polished flute prevents nasty chip build-up that can compromise cut quality and decrease cutter longevity, and the shorter profile contributes to overall durability. Great for cuts up to ¼” in depth and ideal geometry for cutting acrylics and non-ferrous metals