This chapter presents particular exact-constraint designs that are being used for the NIF and EUVL projects. These designs use both flexural elements and contacting surfaces as constraint devices. All the designs have been thoroughly analyzed using various techniques, but this chapter is about design rather than analysis. The intent is to present the thinking behind the designs. Where it is of interest, analytical or experimental results will be mentioned. Most of the figures in this chapter are photographs of hardware. All efforts have been made to ensure good quality, but photographs sometimes do not reproduce well.