We designed our welding cart to work with the HTP America® Pro Pulse™ 300, Invertig™301AC/DC, 313 AC/DC, and Invertig™ 400 AC/DC. This cart can hold up to a 120 cu ft cylinder. The top shelf length is 27 3/8" width 14 5/8" and the second shelf has a width 14 5/8 " and length 27 1/4"