An excavator rubber track(J track) with an offset tread pattern, this rubber track is 15.75 inches wide and has 74 internal metal crossbars that are 2.97 inches apart when measured from center to center. This rubber track will fit the following models; Komatsu style PC40FR-2, FM40; Yanmar style VIO57, VIO-55, B50-2B, VIO50-2.