These multi-purpose dollies have a high polished bright zinc finish for corrosion resistance and (4) 3" x 1-1/4" swivel casters. Each unit comes with a 4 foot long nylon pull strap that helps in transporting down aisles or over thresh holds. Rubber-coated hook allows strap to hook on top of drum for storage. Quad Dolly, series DRUM-QUAD, can transport a 5 gallon pail, 30 or 55 gallon drum or LP gas tank. Available with hard rubber or cast iron wheels. Stainless Steel, model DRUM-QUAD-CS-SS, also available. Tri Dolly, series DRUM-TRI, will transport 5 gallon pails, 30 gallon drums or LP gas tank.