5PCS Masonry Drill Bit Set for Concrete Ceramic & Wood

This is the hardest drill bit we've developed.

Suitable for ceramics, concrete, bricks, wood, glass and alloys.

Specification:
Material: Hard Alloy
Shank: Triangle Shank
Tip Angle: 45° 
Diameter: (6mm/0.24in)(6mm/0.24in)(8mm/0.31in)(10mm/0.39in)(12mm/0.47in)