- Material: Stainless steel. - With wide expansion screw holder. - Plate sections are opened fanwise. - With expansion screw key straight, small – standard. - Indication: for maxillary anterior or posterior expansion - Directional arrow printed, blue, yellow. - Maximum expansion 7.0 mm. - 4 x 1/4 turn= 0.8 mm. **For further product information, please contact Chat Support**