This replacement mower blade, cross-referenced as Stihl 30306 and equivalent to Oregon 91-030, measures 533mm (21 inches) in length, 57mm (2.25 inches) in width, and features a 16mm (5/8 inch) center hole. Designed for durability with a thickness of 3.4mm (0.134 inches), it provides efficient cutting performance for a wide range of lawn tractors and mowers. Compatible with models from brands such as Roper, Partner, Poulan, Husqvarna, AYP, Murray, Sears, and more, ensuring a broad fitment for various residential and commercial mowing equipment.