RDS Fuel Tank Toolbox Combo - 40-Gallon Capacity, Model# 72775 Aluminum Tank and Toolbox - NO RUSTING Heavy-duty 0.125 ga. aluminum used for tank Toolbox built using 0.058 ga. aluminum Toolboxes come with stainless steel locks that also secure fuel fill to prevent tampering, plus two cylinders to hold open crowned lid Fully welded seams