It is a very compact unit, it adds about 1.6" in length. I don't have them on my website yet as I'm working on a whole new site. You can see them here:
http://www.precisebits.com/products/equipment/er16_colletadapter.asp , I have the CEPG-ER16-KIT in stock, which comes with the adapter, closing nut and wrenches: $85.39 USD. I also have a large selection of ER-16 collets in stock for $10 ea.
