Size and Package Content
20pcs * diamond drill bits
Diameter x Length:20pcs 5/32"(4mm) x 1.96"(50mm)

High Quality Material
The diamond drill bits are made of premium high-speed matel.Thicken diamond coating on the tops offers the ability that each sharp bit for a few holes.

Wide Application
The diamond coated bits are perfect for drilling glass,ceramics,light stone,limestone,granite,tile,slate,and fiberglass.

Clever Design
This diamond drill bit with large clearance holes next to the drill bit,these glass hole saws along the drill bit allow for easy access to cooling water and drainage of chips and other particles during drilling.Makes the drilling process easier.

Note
Start drill at 45 degree to surface and align to 90 degree as hole forms.Water is required to cool down the drill when using them.