Heat treated cylinder wall and chromed piston give added stability and longer jack life, Alloy steel lifting mechanism for added durability and operator safety, Precision engineered tolerances for maximum performance, In-line filter to protect air motor from contaminants, Corrosion-resistant aluminum and nylon composite air motor, Ram extension kit included with 3/4"", 2-3/4"" and 4"" extensions, Large 7-3/4"" rear wheels for easy positioning, Automatic in-line oiler to lubricate air motor, Grommet retainers - no need for clevis pins, SKU: ISN13647