Features:

*Install the hole opener on the electric hand drill or small bench drill land use it.

*Because this kind of hole opener has no center positioning bit, the hole opener should be tilted at 45, the speed of electric drill should be slowed down, and the glass stone should be contacted slowly.

*Do not make the opening too fast. It is necessary to add water continuously to cool the opening device.

*When drilling, clean water is needed to cool the drill bit. Good cooling can significantly extend the service life of the hole opener. 

*Do not use the drill bit without water, otherwise the drill bit may be damaged.

*It is recommended to hold the drill bit deeper. If necessary, you can cut off the drill bit to make it shorter, so as to reduce shaking and not easy to break.

*The drilling speed cannot exceed 6000 rpm, because the drilling speed is too high, the drill bit is easy to break.

Specifications: 

Product name: Mini Micro Drill Bits

Material: Diamond Stone

Length: 40mm (Approx. )

Shank diameter: 0.6mm

Drilling diameter: 1mm

Color: Silver

Suitable for: Jade, Marble, Handicrafts

Quantity:  20 Pcs

Package Contents:

20 Pcs Mini Micro Drill Bits

Note:

1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.

2. Please allow slight manual measurement deviation for the data.

Payment must be completed within 5 days. If you have any problems about payment, please contact us via ebay message.

We only ship to confirmed ebay Order addresses. Please comfirm that your Order address is in line with your shipping address.

Please kindly note that the combined shipping is not provided because the shipping fee is calculated by weight. Also, the each additional item means exactly the the same color and size. 

It takes about 7-15 working days to US; about 10-30 working days to other countries. Transit time may be a little delayed because of the bad weather and customs inspection. If you do not receive your item within 30 working days since payment finished, please contact us immediately for further assistance.

We strive for 100% customer satisfaction! Positive Feedback is very important to us. If you have any questions, please feel free to contact us via "Ask seller a question" . We will reply your email within 24 working hours.