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		This electroplated diamond finger bit(sink wheel) 
		is ideal for fast 
		stock removal as well as truing up saw lines, which is usually mounted on CNC 
		machines, radial arm machines, angle grinder, or hand-held grinding 
		machines for 
		hole grinding, anchor and blind hole, working as milling cutter for 
		cutting any arc of marble, limestone, travertine, and other soft stones 
		with chip-free & stable performance. 
		  
		Its grooved water channel provides necessary 
		lubrication while removing slurry from the cutting surface. 
		  
		Wet or dry use, water coolant is much better 
		for drilling performance and working life. 
		  
		The RPM is around 6000-7000. |  |  |