Concrete Saw - 500mm (20in) Petrol for Hire in Blacktown and Sydney. The CONCRETE SAW - 500MM (20IN) PETROL is a compact and lightweight floor saw offering outstanding cutting performance, smooth operation and excellent manoeuvrability. It bridges the gap between hand-held cut-off saws and the more   expensive premium walk-behind floor saws. Ideal for small  cuts in asphalt and concrete, for patching and repairs jobs and   applications such as installing electric fencing, lighting, etc.