1) Product: Multi-purpose drill bits
cobalt and tungsten carbide tip
Well centered carbide tip for easy and fast drilling
Resharpenable carbide tip for repeated use to save money
chrome vanadium steel shank for enormous strength
2)Picture of Multi-Purpose Drill Bits
More pictures of Multi-Purpose Drill Bits
3)Metric Size 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 |
4)Inch size of 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" |
5) 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
