HUSQVARNA LAWN TRACTOR MOWER BLADE FOR BIOCLIP103 , RIDER14PRO , RIDER15V2 AWD , RIDER16 , RIDER16 AWD , RIDER 155 , RIDER 155 AWD , RIDER970 , RIDER1030 , RIDER1200 , RIDER PRO 15 , RIDER PRO 18 , RIDER PRO AWD , RIDER PROFLEX 18 , RIDER PROFLEX 20 , RIDER PROFLEX 1200 MODEL - TECHNICAL SPECIFICATIONS LENGTH 411 mm CENTRE BORE 24. 7 mm OUTER HOLE 8.2 mm MIDDLE HOLE 48.2 mm CODE: 13271031 ORIGINAL CODE: 506 96 63-10 , 506 96 63-01 SR