BLADE KNIFE FOR ROTARY MOWER ROTARY MACHINE TOWER MOWER LEFT ROTARY CASTELGARDEN STIGA GGP FOR MODELS BL440B , BL440SB MODEL - TECHNICAL SPECIFICATIONS LENGTH 438 mm CENTRAL BORE 9. 8 mm OUTER HOLE 10.5 mm CENTRAL HOLE INDEX 52 mm CODE: 13271790 ORIGINAL CODE: 181004121/0 81004121/0 1117-3554-01 1111-9116-01 SR