Focus mount set up the correct distance between the lens of the stereo microscope body and the top of your sample, in order sample to appear in focus when looking through the microscope.Microscope focus mount adjusted by Coarse and fine mechanism knob and tension adjustment.Other name focus mount focusing bracket focus rack focus block

Coaxial coarse and fine focusing
Coarse and Fine Focus Block/Holder focus holder with coaxial coarse and fine focus for high magnification applications, Focusing holders hold the microscope body and contain the mechanism that raises or lowers the body to focus on the specimen
Coarse adjustment knob: moves the stage up or down to quickly view the object in focus.
Fine adjustment knob: Slowly moves the stage up or down to get a more precise and greater detail of the object/specimen.