OMAX Attachable Large X-Y Mechanical Stage for Compound Microscopes Moving range: 2-7/8inch x 1-1/8inch (73mm x 30mm) Accuracy of X-Y movement measure: 0.1mm Dimensions: 5-1/2inch x 5inch x 1-1/4inch (14cm x 12.7cm x 3.2cm); Mounting thum screw: 3.5mm in diameter Distance between 2 positioning pins: 32mm 1-year warranty against manufacturing defects