It allows for beautiful drilling with minimal burrs and cracks. It is also suitable for drilling into fragile materials such as acrylic and bamboo. All size set, 3? 3.5? 4? 4.5? 5? 5.5? 6? 6.5? 7? 7.5? 8? 8.5? 9? 9.5? 10? 10.5? 11? 11.5? 12? 13? 14? 15? 16? 17? 18? 19? 20? 21 (Diameter: mm, Each: 1 piece). We do not mark merchandise values below value or mark items as “gifts” -Japan, US and International government regulations prohibit such behavior. About Importer’s Obligation. Thank you for your understanding.