This is a genuine OEM STIHL chainsaw bar, designed to fit models 051, 076, 084, 088, and 880. The bar is 41 inches long, with a. 063 gauge, and comes with 123 drive links.It is compatible with STIHL brand chainsaws and is powered by gasoline. This bar does not require any assembly and comes with only one piece in the pack. The model number can be found in the description area, and this product is specifically designed for use with chainsaws.