Marble Hole Drill Bit

It leaves a cylinder shape which often is used as sink holes or to feed lines and pipes.
Marble hole drill bit. Hole bits or core bits are specially designed drill bits that are tipped with either diamond or carbide. Marble drilling bit self centering marble drilling bit creates the perfect indentation to keep marbles in place on a board. These core bits are made up of a concentration of diamonds and metal bonds in order to cut the hard surface of the granite. K kwokker 15pcs masonry drill bits set 3mm to 16mm for glass concrete marble plastic brick tile wood and cement tungsten carbide paddle shaped tip triangle alloy professional masonry bit 4 2 out of 5 stars 70 19 77 19 77 get it as soon as thu may 7.
Rather than relying on channel action like normal bits core bits have a central pilot bit that holds the bit in place while the outer sections of the bit cuts a hole through stone.