DEV-50-44. Assembly Device for Glass Bottom dish KIT, dish size 50mm, well size 40mm. Single Unit. Compatible only with Kit D50-40-1.5-K Assembly Devices are created, to be able to make your own dishes and use ‚any type of a glass bottom‘. These products are only compatible with WillCo-dish®KIT - ‚Do-It- Yourself‘ Glass Bottom Dishes (See pages 12 and 16). This may be glass (and there are many different types), quartz (natural or synthetic) or a kind of plastic or even foil, at your own choice.