Fits: Alko Silver 51B, Silver 520 BR, 520 BRE, 5210 HPD, 5210 HW, 5250 HWS, 525 HWS. Mower Blade. Thickness: 4mm. Side Hole Centres Distance: 65mm Apart. Side Hole Dia.:13mm. Bore DIa.: 19.4mm.
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