JINGLING 6mm 1/4" inch Diamond Hole Saws Drill Bits Tools for Stone Pack of 2Pcs

JINGLING 2Pcs Diamond Hole Saw Drill Core Bit 6mm 1/4" 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: 1/4 in Sintered diamond core drill bits, 6mm Diamond sintered bits
Hole/Outer Diameter: 6mm (1/4" inch)
Shank Diameter: 5mm
Total Length: 75mm (3" inch)
Drilling Depth: 25mm (1" inch)
Recommend Speed:3140-6280RPM
Quantity: 2 Pcs
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 center section of limestone