STAINLESS STEEL UNDERBODY TRUCK TOOL BOX WITH POLISHED STAINLESS STEEL DOOR SERIES - 1702603. 1702603 - 18X18X30 STAINLESS STEEL TRUCK BOX WITH POLISHED STAINLESS STEEL DOOR. Available in a variety of sizes, each professional grade box is made of strong 14 Ga stainless steel with a 16 Ga stainless steel door.