Outus 3 Pcs Auto Body Filler Spreader Tool Set, Multi-Size Steel Spreader. Steel Construction: these car dent repair tools are made from good strength steel; It features high hardness and strong toughness, along with excellent corrosion resistance; It is not easy to deform or break; The steel body filler spreaders are designed to smoothly conform to surfaces during use, aiming for efficient application on large areas like hoods, roofs, and doors.