For cutting logs into boards. Stihl model 420G. Fits chainsaws with a 630mm bar and ripping chain. Probably takes other brands of chainsaw, but I am not certain about that.However, the instructions contain dimensions for fitting the bar so I imagine they can be applied to other brand bars. Maximum log diameter 420mm. Depth of cut 13mm to 300mm Weight without chainsaw attached 9.6kg Never used : in as-new condition Complete with Instruction Manual. For illustrative purposes, one of the photos shows the bar with a chainsaw fitted. That saw is not included in this listing