The Bell (Die Glocke) miniature is based on the writings about this Sci Fi like anti-gravity weapon from the WWII era.
You can read more about it on Wikipedia
http://en.wikipedia.org/wiki/Die_Glocke.
The model has a round grill plate that must be removed from the sprue and placed in the hole on the underside of the Bell.
This model is also available on Shapeways in 1:144 scale and 28mm/32mm scale.
You can also see some of The Bell's painted on my blog at
yeomanmodels.com