Blade kit with original blade hub for GRIN traction lawnmower mower for models HM53A - PM53 PRO - SPM53 PRO Blade size: Blade length: 520 mm Central hole diameter: 19 mm Side hole diameter: 5 mm Traction blade hub size: Hub height: 100 mm Upper diameter: 47 mm Lower diameter: 62 mm Upper hole diameter: 20 mm Lower hole diameter: 8 mm Traction height: 25 mm Traction diameter: 47 mm Traction hole diameter: 20 mm Blade CODE 53 : BT-D53-0002 CODE Traction blade hub: BT-TR-0007