Dimensions of inner bow of facebow are?

Components of a facebow Kloehn facebow is made from rigid stainless steel wire framework. It has a horseshoe shape/dental arch form of inner bow of 0.045-in. diameter and an outer bow of 0.071-in diameter. The inner bow follows curves/arch form of the maxillary arch, while long arms of the outer bow lie on either side of face extending close to the tragus of the ear. Both bows are laser welded or soldered in incisor region, strong enough to withstand orthopaedic forces that are applied to the inner bow through extraoral traction system, either from a cervical neck strap or a high-pull headgear. Cervical facebows are commercially available in different sizes to suit variable arch lengths.