4mm 3/16 inch Diamond Coated Core Bit Hole Mini Saw

Description :
4mm 3/16 inch Diamond Coated Core Drills Bit Hole Saw
Specification :
Use diamond powder to sophisticated plating process refined
Opening the holes are neat, smooth
The surface through the nickel plated, suitable for glass, marble, tiles, floor tiles, ceramics, etc., suitable for variable speed hand drill, bench drill.
Operation method :
Tilt at the tile, glass surface grind a shallow traces.
Drill  put positive and continue to grind out  deep crescent marks.
With original speed rotation, until the drilling is completed.
Note :
When using the drill the speed must be slow to avoid shock
Need to constantly add water (A, cooled.  In order to avoid friction and high temperature damage the drill;  b, a glass frit and the residue of water can be cleaned between the diamond particles, resulting in decreased drilling efficiency to avoid clogging)
Package includes :
1 x 4mm Diamond Coated Hole Saw
Details pictures :