Jewelry 3D model skull ring is ready for 3D printing and CNC milling (STL file is checked). The model can be used for jewelry production (casting and machining), rendering, etc. STL, OBJ and 3DS files are available, so you can import it to various 3D software.Ring size: inner diameter – 18 mm; need another size – it's FREE, just contact me.Dimensions model 20х21х25 mm The hole diameter of about 18 mm Volume Print 1.34 cm ^ 3