JINGLING 25mm 1" inch Diamond Hole Saw Sintered Core Drill Bits Tools for Stone

JINGLING Diamond Hole Saw Drill Core Bit Diameter 25mm 1" inch for Marble Stone Granite Tile
New professional diamond marble hole saw core drill, made of high quality diamond with precision drilling speed and long life use
Description:
Product Name: Sintered diamond core drill bits, Diamond sintered bits Material: Metal, diamond
Hole/Outer Diameter: 25mm (close to 1" inch)
Inner Diameter: 20.5mm
Drilling Depth: 50mm (close to 2" )
Total Length: 75mm (3")
Recommend Speed: 2080-4160RPM
Quantity: 1 Piece
Material: Metal, diamond
Color: Gold Tone
Application: Mainly used for drilling Stone, Marble, Granite ,Rebar Concrete and other hard material
Ideal for drilling the faucet mounting holes in stone countertops, plumbing lines in showers, and vanities
We don't recommend drilling holes in smooth ceramics and glass, because it is difficult to complete the drilling operation, and the edge of the hole will chipping
Method of Use: Use Wet or Dry
To prolong its using life, must use with water for cooling and lubrication
Gold paints on the body of this bit to avoid getting rusty
Feature drilling stably, fast speed, not breaking the border
The hole saw can be used with Bench drill, hand electric drill
When you using hand electric drill, start slowly, 45 degree angle, go vertical after you make an initial mark
How to use a hand drill to drill holes in the stone/tile?
Step 1. The bit on the stone/tile 45 degree, open a half-moon notch on it
Step 2. Slowly up the bit to 60 degrees, and then gently drill
Step 3. Reached 90 degrees, continue to drill
Step 4. Drill through the stone/tile finally, the technique requires a "wobble" of the drill rather that steady pressure straight on
The other considerations are depth, if you go more than the 1" or so the bit allows you will need to stop drilling and take a cold chisel to remove c