The DL-BKIT19 optical delay line kit is configured as a single pass design ultizing the New Focus 9848-KT retroreflector assembly with Newport's 10D620ER.2 ValuMaxTM silver mirrors mounted in ULTIMATM clear edge mirror mounts. To insure maximum compatibility to Newport's motion stages, all mechanical parts in this kit are metric compatible. All screws, clamps, posts, post extensions for mounting are also included in the kit. Please purchase the motion stage and controller separately.