For jobs that demand the best, toughest and most ergonomic tools. Power and precision from Japan. The lightest saw in its class, the 501SX is packed with professional features. These include a starter grip assist cap opener, a tool-less air filter cover allowing easy air filter access, even when wearing gloves; a side access chain tensioner enabling easy chain adjustment; an anti-icing system preventing the carburettor from freezing in colder months.