- Material: stainless steel. - With cone-shaped expansion screw holder. - Minimal fan-type opening of the arch screw, according to the anterior arch. - With expansion screw key straight, small – standard. Indication: for transverse expansion of the mandibular anterior arch. - Directional arrow plastic, neon yellow. - Maximum expansion 5.0 mm. - 4 x 1/4 turn = 0.8 mm. **For further product information, please contact Chat Support**