Usage method:
✔Install the drill bit on the professional drilling machine such as ordinary hand drill or bench drill.
✔Since this kind of drill does not have a central positioning drill, let the drill tilt at 45 degrees before operation, slow down the electric drill and slowly contact the stone.
✔Open a crescent groove on one side of the hole (crescent groove can play a positioning role), and then erect the electric drill to start work.
✔The rotating speed should not be too fast during the hole opening, especially at the beginning of drilling and when the hole is about to be drilled through, it is necessary to continuously add water to cool the hole opener during the hole opening process.

Precautions for use:
✔When drilling, use clean water to cool the bit. Good cooling not only significantly prolong the life of the bit, but also significantly improve the drilling speed. It is better not to dry drill without water, otherwise it is easy to cause damage to the bit.
✔Diamond hole drill is not suitable for metal material processing.
✔Do not knock the hole drill when loading and unloading the drill bit and taking out the drill core to prevent the drill bit from breaking and deformation.
✔If the drill bit becomes blunt, you can drill holes on the grinding wheel or refractory brick and re-blade.
✔Select the appropriate hole drill according to the processing material, so that you can work more, faster, better and more economically.