Choice A 13PCS Metric Tungsten Carbide Drill Bits Set Professional Multi-Material Drilling for Glass, Meta

Describe
135 degree split point
135 degrees means less force is required to remove metal compared to smaller angles such as 90° and 118°.
Self-centering split points allow you to drill directly to the desired size without any pre-drilling.
Twist drill bit body
Heavy-duty, fully ground body construction.
High flow design allows for fastest removal rates and thick materials.
Straight handle
Standard drill chucks feature straight shanks to reduce "walking" or "wandering".
The handle end is chamfered for an easy and secure grip.
vertical
Keep the drill bit perpendicular to the of the object to be drilled.
Inclined drill bits are prone to breaking during drilling.
Make sure both the drill bit and the workpiece are stable.
Metal drilling requires low RPM. Please use a device that can adjust the drilling speed.
Be careful when using an electric drill. The RPM may be set too high.
The thicker the drill bit, the slower the speed should be.
The friction between the drill bit and the metal can build up a lot of heat.
Coolant is used to keep the drill bit cool during the drilling process. Otherwise, the drill may fry (melt) or only last a short time.
Either use lubricant or pour water.
It is highly recommended that you use a drill press to drill thick metal. It's stable, powerful, and (RPM) adjustable.
If you don't have a drill press, an electric or cordless drill can get the job done. However, unless you're really experienced, you're likely to run into problems.

Package includes: 13pcs*High speed steel drill

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