GeoTrencher® replacement 50mm wide chain for GR500 bar. Sold singly, will only fit Makita® EK7650H, EK8100 (GeoRipper GR20, 720 and 820 series) and all Husqvarna® models. Please contact us if in doubt. For use instead of standard 38mm chain when a larger 50mm wide trench is required.