Apple Performa 6400/180 - Manual (Page 72)

Specifications Physical - 18
Physical
Dimensions
Height: 16" (406 mm)
Width: 7 13/16" (198 mm)
Depth: 16 7/8" (428 mm)
Weight
44.5 lb. (20.18 kg) without CD-ROM
Weight varies depending on type of hard disk and other options.
Does not include monitor.