☪Upgraded Dry Drilling Design : Mgtgbao Diamond Drill Bit integrated with wax lubricant inside which melts while dry drilling and cools the cutting surface; Water can be used as additional cooling to prolong the life of the bit. Surface plating can prevent the drill bit from rusting. ☪Multiple Size Dry Diamond Core Drill Bit: The diamond drill bit set contains 6 pieces of dry diamond bits different sizes, including 1pc 3/16” (5mm), 1pc 1/4” (6mm), 1pc 5/16” (8mm) , 1pc 3/8” (10mm), 1pc 1/2” (12mm) , 1pc 9/16” (14mm) fit your need. ☪Widely Compatibility: black diamond drill is designed in round shank, which is compatible with most machines, such as hand drill, angle grinder, bench drill, also can be matched with side flutes help to remove debris and drill holes smooth and fast; Depth mark is also useful for precise project. ☪Easy To Carry: These Diamond drill bits are prevented from being in a gray box, and can be put back into the box for storage after you use it. ☪Wildly Application: Mgtgbao dry diamond drill set can be applied for drilling clean holes to hard materials, which especially fits well for tiles, porcelain ground, granite ceramic glass mirror marble stone masonry brick and so on; Note: not applicable to wood. Mgtgbao Dry Diamond Drill Bits :1pc 3/16” (5mm), 1pc 1/4” (6mm), 1pc 5/16” (8mm) , 1pc 3/8” (10mm), 1pc 1/2” (12mm), 9/16” (14mm) with Hex Shank for Porcelain Tile Ceramic Marble

Feature:
Multi-purpose drilling for granite & marble, masonry, concrete, tile/ceramic, stone
Wax inside for cooling,our Diamond Tipped Drill Bits have wax cores built-in which automatically absorb and dissipate heat as you go
Dry drilling and Use water for longer time.Notice:Please use with water when drilling granite
Vacuum Brazed diamond technology provide very high efficiency,cuts faster and lasts longer
Size: 3/16” (5mm), 1pc 1/4” (6mm), 1pc 5/16” (8mm) , 1pc 3/8” (10mm), 1pc 1/2” (12mm) , 9/16” (14mm)
Quality:6pcs
Lengthen 3/16 ,1/4 (65mm) and other sizes (80mm)

Package includes:
1pc 3/16 inch (5mm) diamond drill bits diameter
1pc 1/4 inch (6mm) diamond drill bits diameter
1pc 5/16 inch (8mm) diamond drill bits diameter
1pc 3/8 inch (10mm) diamond drill bits diameter
1pc 1/2 inch (12mm) diamond drill bits diameter
1pc 9/16 inch (14mm) diamond drill bits
1 x Gray Storage bottle

Using Steps:
Step 1: Start Drilling the hole in an angle about 45 degrees to the surface, so the drill has the chance to start and will prevent the drill slipping
Step 2: Slowly move the drill bit into a more up-right position and wobble the drill bit in the circular motion
Step 3: Do not need to apply much pressure, let the drill bit do the work, you will feel the drill bit break through the back of the glass or tile once the hole is completed
Step 4: Take care when using them as a bit can glaze and burn out if use too fast