Features:Microscopes Adjustable Focusing Bracket Plane Frames, Steel Rail Rack Focusing Mechanism Connectiong Objective: DIA 76mm Connectiong Pillar: DIA 32mm Stand Size: 200 mm x 255mm x 250mm Easy Large-Sized Focusing Knobs on Both Sides of Focusing Holder. Steel Gears on Focusing Holder. Standard Size Focusing Holder - Will Fit Scope Heads with Diameter of 76mm Packing including:1 x Base 1 x Pillar 1 x Focusing Holder