VIKING MT 640, MT 680 Adaptable lawn mower blade Features: Length (mm): 520 Centre hole (mm): 16.3 Outer hole (mm): 10.4 Centre-to-centre distance (mm): 74 Weight: 1.16 kg Part No.: 13270231 Part No.: 6124 702 0104 , 6124 702 0101 VIKING SR m