... and excavators, poerating under rocky harsh conditions in pit lane tunnel, 2.1400-20,29,5-29 1. suitable to loaders, scrapers ... and excavators, operating under rocky harsh conditions in pit lane, tunnel, etc, special stock compound provides optimum cutting and wear resisitances ... treads increase rock puncture resistance, provide extremely high cutting resisitance.2. size: 12.00-20,12.00-24,14.00-20 ...