1)Multi-purpose drill bits
Made by cobalt and tungsten carbide tip, Special degrees of carbide to enable well centered drilling, the chrome vanadium steel shank provides extra hardness and torque force
Application: Masonry,Ceramic tile,Concrete,Brick,Fiberglass/Plexiglass/Glass,Cast metals,Hardened steel,Granite,Marble,Woods,Plastics,Eliminates etc. Sizes are from 3mm-25mm (1/8"-1")
Carbide Tip of multi-purpose drill bits in black flute
2)Picture of multi-purpose drill bits 
3)reduced shank of multi-purpose drill bits 
4)Skinned card packing for multi-purpose drill bits
5)Metric sizes of multi-purpose drill bits
| Metric | Total Length | Shank |
| 3mm | 70mm | Straight |
| 4mm | 83mm | Straight |
| 5mm | 89mm | Straight |
| 6mm | 108mm | Straight |
| 7mm | 111mm | Straight |
| 8mm | 114mm | Straight |
| 9mm | 127mm | Straight |
| 10mm | 160mm | Straight |
| 11mm | 160mm | Straight |
| 12mm | 160mm | 9.52mm |
| 13mm | 160mm | 9.52mm |
| 14mm | 160mm | 9.52mm |
| 16mm | 160mm | 9.52mm |
| 18mm | 160mm | 9.52mm |
| 20mm | 160mm | 9.52mm |
| 22mm | 160mm | 12.7mm |
6)Inch sizes for multi-purpose drill bits
| Inch | Total Length | Shank |
| 3/32" | 2-3/4" | Straight |
| 1/8" | 2-3/4" | Straight |
| 5/32" | 3-1/4" | Straight |
| 3/16" | 3-1/2" | Straight |
| 7/32" | 3-3/4" | Straight |
| 1/4" | 4-1/4" | Straight |
| 9/32" | 4-3/8" | Straight |
| 5/16" | 4-1/2" | Straight |
| 11/32" | 5" | Straight |
| 3/8" | 5-15/16" | Straight |
| 13/32" | 6-1/4" | Straight |
| 7/16" | 6-1/4" | Straight |
| 15/32" | 6-1/4" | 3/8" |
| 1/2" | 6-1/4" | 3/8" |
| 9/16" | 6-1/4" | 3/8" |
| 5/8" | 6-1/4" | 3/8" |
| 3/4" | 6-1/4" | 3/8" |
| 7/8" | 6-1/4" | 1/2" |
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
