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A pillar drill can cut through almost any material if the speed is correct and the appropriate drill bit is used.
knife to cut
The colour is irrelevant , that just depends on the manufacturer. To cut through concrete you need a 'carbide tipped' drill bit. This tip is a little wider than the drill bit and is quite obvious.
Synchronous motors have unmeasureable slip because they stay in sync with the input line frequency.
Diamonds are widely used in the tool industry to tip drill bits and to edge blades that cut tile, stone and rock.