Hooded ceramic coop cup easily attaches to all cages with screw on universal clamp. Comes in assortment of black, blue, green and white marble. 
 

Measures:

Large 7_1/2 inches high and 4_5/8 inches across the bottom

Small 5_1/2 inches high and 3_5/16 inches across the bottom

Note: As shown in the picture, the top bulges slightly from the bottom of the crock. The measuement above is taken literally across the bottom of the crock and does not take the bulge into account.