Step Drill Bit,Knoweasy HSS(6542) Titanium Coated Spiral Grooved Step Drill 3-Piece Set,4-12mm/4-20mm/4-32mm Drill Bits Set for Sheet Metal Hole Drilling

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✅【High Quality Material:】HSS 4241 & classic high speed steel with titanium coating for strength and longevity.
✅【 Double-edged Design:】The hexagonal shank titanium drill uses a double-edged design to make cutting smoother and smoother.
✅【 Product Feature:】4-12mm / 4-20mm / 4-32mm,Handle: 1/4" quick-change hex shank for drilling, drill holes of different sizes.
✅【Application:】Perfect for home repairs and light jobs such as drilling holes in plastic, aluminum, copper,iron sheet and many other types of sheet metal.
✅【After Sales Warranty:】Your customer satisfaction and 12 months warranty of step drill bit can be guaranteed.

Made of premium material for durable and practical use.
Can be used for many different materials such as steel, brass, wood, plastic, copper,glass fiber and PVC.
The drill sizes clearly lasered, precise drilling easy.
Fits all common drills/cordless screwdrivers.

lmproved grooved design allows easier chipremoval and automatically deburrs holes

The split point tip is at 135 degrees which allows you to cut faster throughout multiple uses. This also ensures that you get sharp cutting on a wide varietyIncreased Cutting Speed of materials.

The tri-flatted shank is a great universal fit that will give you confidence while you work knowing that your drill bit is securely in place.

Notice:

During the operation, water must be injected to cool the drill bit. During the operation, the high temperature smoke is easy to be annealed,so as to avoid reducing the service life of the drill bit.
For pistol drill users, the metal thickness should not be more than 3 mm, while bench drill users can use 3-5 mm.
When the new bit is running in the hole with low axial pressure and low rotation speed for 20-30 minutes, it should be gradually increased to normal axial pressure.
When drilling a new hole with a new drill bit, it is necessary to remove the debris (rocks, scrap metals, etc.) around the hole. At the same time of rotation, ventilate slowly and close to the surface to prevent the bit from being knocked down and damaged by impact.
When the drilling tool is in the hole, reverse rotation is strictly prohibited to prevent the bit from falling into the well.
When the drill bit is in the hole and the air compressor stops working suddenly, rock slag is very easy to enter the drill bit.
Therefore,it is strictly forbidden to rotate for a long time, resulting in bearing wear, rock slag repeated crushing (or sticking), and bit wear is accelerated.

Made of premium material for durable and practical use.
Can be used for many different materials such as steel, brass, wood, plastic, copper,glass fiber and PVC.
The drill sizes clearly lasered, precise drilling easy.
Fits all common drills/cordless screwdrivers.

lmproved grooved design allows easier chipremoval and automatically deburrs holes

The split point tip is at 135 degrees which allows you to cut faster throughout multiple uses. This also ensures that you get sharp cutting on a wide varietyIncreased Cutting Speed of materials.

The tri-flatted shank is a great universal fit that will give you confidence while you work knowing that your drill bit is securely in place.

Notice:

During the operation, water must be injected to cool the drill bit. During the operation, the high temperature smoke is easy to be annealed,so as to avoid reducing the service life of the drill bit.
For pistol drill users, the metal thickness should not be more than 3 mm, while bench drill users can use 3-5 mm.
When the new bit is running in the hole with low axial pressure and low rotation speed for 20-30 minutes, it should be gradually increased to normal axial pressure.
When drilling a new hole with a new drill bit, it is necessary to remove the debris (rocks, scrap metals, etc.) around the hole. At the same time of rotation, ventilate slowly and close to the surface to prevent the bit from being knocked down and damaged by impact.
When the drilling tool is in the hole, reverse rotation is strictly prohibited to prevent the bit from falling into the well.
When the drill bit is in the hole and the air compressor stops working suddenly, rock slag is very easy to enter the drill bit.
Therefore,it is strictly forbidden to rotate for a long time, resulting in bearing wear, rock slag repeated crushing (or sticking), and bit wear is accelerated.

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