This is a focus rack for major brand stereo microscopes. It comes with ball bearing and 3" (76mm) diameter of annular ring that holds microscope head.

Features & Specifications:

• Brand new focus rack with ball bearing
• Focus gear with coarse focus and tension adjustment
• Diameter of annular ring holding microscope head: 3" (76mm)
• Diameter of opening for stand post (arbor): 1-1/4" (32mm)
• Distance between central line of annular hole and that of microscope body: 5-1/2" (140mm)
• Focusing distance in vertical direction: 2" (50mm)
• Shipping Weight: 4 lbs
• Manufactured under ISO 9001 Quality Control Standard