COMPATIBLE ROTARY MOWER MOWER Blade Optima 53 SPB , Smart 53 SPO Features: Centre hole (mm): star , 4 teeth Outer hole (mm): 8 Centre-to-centre distance (mm): 63,5 Length (mm): 539 Part No.: 13289597 Original Ref.: 742-05024 MTD , YARD MAN , GUTBROD SR m