Features:

1. used in lingual side.
2. Fine medical stainless steel, good quality, competitive price.
3 maily used in dentistry dentition orthontic arch extensions for arch stenosis and posterior crossbite patients
4.Ultra small body for patient comfort
5.Expands to exactly 8/9/10/11/13 mm - has Lock to prevent over expansion
6.Will not unwind - screw is plastic lined to prevent back winding.