Description:

Using high quality diamond powder plating

★ The opening neat and smooth, without broken edges and does not produce tremors

★ Cut resistance, fast aperture speed, chip easily

★ Can be used in glass, ceramic, marble, for drilling hard and brickle material, such as

Method of use:

Glass opened hole device is installation in General hand drill Shang using of (drill can adjustable speed better), due to this opened hole device no Center positioning bit, operation of when to carefully, first way hole device slow speed oblique with contact glass useless opened hole of side opened a months teeth slot, then put are bit, with this Crescent slot to positioning, such on can smooth completed opened hole job, note in opened hole of when speed cannot too fast, must to slow, in opened hole of process among must to plus water cooling opened hole device, or easy 开孔器 ！