HUSQVARNA mower blades for RIDER 15T , RIDER 15V2 , RIDER 155 , RIDER 16 , RIDER 175 , RIDER 175 AWD , RIDER 18 , RIDER 18 AWD , RIDER PRO 18 , RIDER 18 PRO AWD MODEL - TECHNICAL SPECIFICATIONS LENGTH 390 mm CENTRAL BORE 10. 2 mm OUTER HOLE 8.5 mm MIDDLE HOLE 40 mm CODE: 13271354 ORIGINAL CODE: 504 18 82-10 , 504 18 82-01 , 544 10 30-01 SR