Troy-Bilt TB370 163cc 21-inch In Step RWD Self-Propelled Lawn Mower Powered by a 163cc Briggs & Stratton engine with ReadyStart choke system for an easy start Equipped with a 21-inch Tri-Action cutting system to give you a clean cut in one pass. Adjust the cutting height up to 6 different settings ranging from 1.25-3.75 inches. Designed with a 3-in-1 capability to side discharge, mulch or rear bag. Remove blade from the adapter for testing balance. Easily raise and lower cutting height with the single-lever height adjuster. Backed by a 2-year limited warranty.