The punched Spacer of the coin cell is specially designed for In-situ X-ray analysis. The 5mm window in the center allows for in-situ X-ray analysis of battery material phase transition during cell charge and discharge. The price is for the punched spacer only, 50 sets.
It is made of Stainless Steel 304, 15.8mm diameter *1.0mm thickness, with a hole with 5mm diameter in the center. Customization is available.