This condenser pinion shaft with brass gear fits Nikon Labophot, Optiphot and Alphaphot 1 and 2 series microscopes. It's carefully made to exact specifications, replacing original Nikon part number 2B264-001-1. This brass pinion gear provides extended life over all plastics. Note: Always ensure the condenser dovetail is lubricated and moves freely before installing this pinion shaft. Need a microscope part not listed on Amazon? Message us and we'll list it if we make it. Custom orders accepted.