Ryobi Commercial ZR51930 Curved Shaft String Trimmer (Certified Refurbished) This Certified Refurbished product is tested & certified by the manufacturer to look and work like-new. The product includes all original accessories, and is backed by a 1 Year warranty. Forged steel alloy crankshaft, supported by heavy-duty ball bearings, provide balanced movement for less vibration and longer engine life Ergonomic handle is padded for comfort and reduced operator fatigue Split-shaft coupler allows you to interchange your trimmer quickly and easily with Expand-it attachment tools 17 in. cutting width quickly finishes yard projects