1) Product: Multi-purpose drill bit  

Cobalt and tungsten carbide tip, chrome vanadium steel shank

To drill holes on hardened steel, ceramic tile, marble, plastic, cast iron, concrete, porcelain, glass, and woods etc.

2)Straight shank of Multi-purpose drill bit for cutting metal sheet

3)Reduced shank multi-purpose drill bit

4)Skinned card for multi-purpose drill bits 

5)Metric Size of multi-purpose drill bits

6)Inch size of multi-purpose drill bits

7) Drilling Instruction

Please follow the speed and technique instructions below

Hardened Steel and Iron            2000—4000 RPM (Lubricant)

Masonry/Concrete                 2000—4000 RPM (Percussion)

Stainless Steel                    1500—2500 RPM (Coolant)

Glass/Tile/Granite                  300—600 RPM

Plastic and Laminates               300—600 RPM

Solid Surface Materials              300—600 RPM

Wood and Composite                500—1000 RPM