Single wire saw for dressing blocks and cutting slabs. Has two main flywheels of large diameter (120, 250 or 200 cm as to the maximum cutting height needed) to maximise the cutting speed and the life of the diamond wire. The wire tensioning system is hydraulic or fitted with a fully electronic control and tensioning system and with a PLC for automatic slabbing. The big flywheels (diam 2000 or 2500 mm) reduce diamond wire stress. All the above machines can be supplied in the Roller version with the machine on track, and the blocks stationary.