Vacuum Tube Box, 2-1/4" x 2-1/4" x 6-1/8", Fits KT88, 6550, 2A3, 807 Plain White boxes for vacuum tubes Keep your tubes safe in these durable, heavy paper tube boxes Fits KT88, 6550, 2A3, 807 2-1/4" x 2-1/4" x 6-1/8" Inside Divider to keep tubes secure