The SRM-3021TES/U is a powerhouse, featuring an incredibly powerful ECHO engine and a high torque gear case. WithWith a 1:1.62 gear reduction ratio, it generates outstanding levels of torque – up to 50% more than previous models. This means you can move from short grass to tall, dense brush and get consistently clean cutting. SRM-3021TES/L is compatible with an optional metal blade for cutting heavier brush.