Echo SRM-2120SF Line Trimmer 21.2Cc String Shaft Speed FeedThe SRM 2120SF String Trimmer is designed for homeowners seeking speed and convenience. It features a 16 in. cutting swath for fast trimming, a Speed Feed head for quick line changes, ergonomic handles, and the i 30 starting system, which reduces starting effort by 30%. Features: 21. 2 cc professional grade, 2 stroke engine i 30 starter reduces starting effort by 30% Speed Feed 400 Trimmer Head for lightening fast line changes