There are two microscope head holders available for these flexible, modular systems. These brackets are suitable for all stereo microscope stands and universal stands (excluding spring loaded arm), to make focusing possible.Holder with coaxial coarse and fin focusing knob and adjustable torque of the hand wheel. Suitable for all universal stands (except of spring loaded arm) and for all basic stands as possible accessoires.Diameter of the connector for the microscope head: 76 mmDiameter of the connector for the stand: 25 mm