1) Product:TCT Drill for Hardened Steel
made of superb carbide and over 1000 degrees of welding technology
especially good at drilling on hardened steel
Metric size: 3mm-- 12mm
Inch size:1/8"- 1/2"

Common size: 5x90mm
            10 x 120mm

2)Application: to drill holes on marble, granite, especial popular used in stone factories

3)Picture of working condition