A Cut Above the Rest. The exclusive WORX tool-free chain replacement and auto-tensioning system eliminates the headaches faced with most other chainsaws. You don't need to be a lumberjack to operate a chainsaw. The auto-tension system includes a single oversized knob that secures the bar and chain and maintains proper tension during operation--automatically. The WORX auto-tensioning system also works to extend bar and chain life by eliminating any chance of over-tightening. What's more all-metal dogs at the base of the 18-inch long bar help add stability during cutting while an easy-to-lubricate sprocket on the bar nose helps preserve the life of the tool. Powerful enough for your toughest jobs this WORX chainsaw produces 4.0 Hp at its peak! Designed for Safety and Comfort. The 15 Amp WORX 18" Chainsaw includes a built-in safety chain brake that stops the chain in seconds when improper contact is made protecting you in the event of kickback. Additionally a rubber over-molded rear handle and ergonomic full-wrap front handle provide optimum operator control and comfort. Features: Tool free tensioning system, Built-in chain brake for extra safety, Automatic oil lubrication with built-in oil reservoir, Oil reservoir level indicator, Comfortable grip with rubberized rear handle, 3/8” Pitch reduced kickback chain, 120V – 60Hz With 15 Amps of power, 4.0 Hp Peak power, 18” Bar length.