A very fast and strong drill bit that can be used in very hard both coarse and fine-grained materials like:
Granite Concrete, Concrete, Masonry, Bricks, Industrial Tiles, Glazed Tiles, Limestone, Glass, Terrazzo, Marble, Terracotta, Cement, Roof Tile, Eternit, Repair Mortar.
A faster drill bit than K19, and can be used in materials like:
Masonry, Bricks, Industrial Tiles, Glazed Tiles, Limestone, Glass, Terrazzo, Marble, Terracotta, Cement, Roof Tile, Eternit, Repair Mortar.
A drill bit that is faster than both K19 and K20 which can be used in materials like:
Masonry, Bricks, Industrial Tiles, Glazed Tiles, Limestone, Terrazzo, Marble, Terracotta, Cement, Roof Tile, Eternit.
K19, K20 and K21 is furthermore designed for drilling in most wood types without the drill bit tip overheating. This results in a faster working procedure when you work with both wood and masonry, as you avoid pre-drilling and don’t need to shift between “rock drill bits” and “wood drill bits”
One of the biggest strengths about the drill bit is of course that you avoid hammer drilling. The noise is reduced massively by this, and it’s a big advantage on building sites, but also in a multi-storey building where you can avoid annoying the neighbors.
Another very big advantage is that the drilling is vibration free, and this means you will avoid “vibrating white fingers”.
The tests from DTI reveal that KB Drill Bits has more than double the amount of durability compared to the market's best drill bits.
See the page “Test Results”.
Why is KB faster?
The problem with an ordinary masonry drill bit is that the drill bit is prevented from cutting the material due to the tip of the drill bit.
The first thought is that the drill bit shall be as pointed and sharp in the tip as possible.
This is standard for masonry multi drill bits today.
The problem with this type of drill bit is, that this type of drill bit cannot penetrate the material because the tip of the drill bit is an obstacle. Standard type of drill bit "Dances" on the tip.
This can be bypassed by drilling with a smaller drill bit first. But it takes time and small diameter drill bits usually has a short length.
In other words, it is about removing the core so that the cutting surfaces can work down through the material.
KB drill bits have solved this problem.
A narrow groove is cut into the tip of the bit.
When drilling in porous materials such as bricks, concrete or the like
the two cutting surfaces immediately cut their way into the material.
In the middle a small material column appears. When the drill bit rotates, the lateral micro movements will break the material column, because the porous material can only withstand a direct pressure from above. In this way the core is removed constantly and the cutting surfaces can work unobstructed.
This means a much higher drilling speed, less heat generation, and more than double durability. In particularly hard materials such as ceramic industry tiles and repair mortar with a hardness of up to 50 MPa, the test shows that KB drill bits work fast down through the material and therefore do not overheat with loss of the cemented carbide plate as a result.
By keeping the groove width in the tip of the drill between 0.7-1.2 mm (4-14 mm drill bit diameter), the drill bit instantly bites into the material. If the slit width is increased, the drill will tend to migrate to the side before it gets hold of the material.
By increasing the depth of the slit to 1.3 - 1.8 times the width, the speed of the hard materials is maintained.
For the bigger drill bits (15 -45 mm) the groove can be between 1,2 - 1,5mm and work perfect withuot "going sideways".
A side benefit shows that KB drill bits easily drill in glass. When drilling in glass, a few drops of ordinary water are added to cool the drill bit and the material.