This blade disc is used for skid plate robots. If you do not have a skid plate, use 580 79 28-02. 574 48 71-01 - Cutting disc It fits Flymo 1200R, 2013-06 1200R, 2016-2017 Gardena R80Li, 2016-2018 R70Li, 2016-2018 R50Li, 2015-2018 R45Li, 2013-2018 R40Li, 2012-2018 R38Li, 2015-2017 Husqvarna AUTOMOWER 305, 2011-2015 McCulloch ROB R600/ROB R1000, 2017-01 ROB R600/ROB R800/ROB R1000, 2018-