Expander Bertoni Max Exp 5 mm front, 3.5 mm Back - Piece

• A Bertoni type expander. 
• Max.Exp Frontal: 5.0 mm.
• Max.Exp Back: 2x3.5 mm.
• Full Turn: 0.35 mm.
• 1/4 Turn: 0.87 mm.
• Pins & threads are manufactured from medically biocompatible stainless steel.
• Housing made from stainless steel.
• Screw threads have a low tolerance of .01 mm and are very secure to ensure stability.
• All screws come with one activation key.

     Used for:

1. Same as Item # 19-521- 105, but the transverse screws open in the same direction.