1)Products: Multi-Purpose Drill Bits
Metric size: 3-22mm; Inch size: from 1/8"-1"
Copper color, black flute
Cobalt & Tungsten Carbide Tip,Chrome Vanadium Steel Shank

2)Picture of Multi-Purpose Drill Bits in cooper color black flute

18mm 160mm 9.52mm

20mm 160mm 9.52mm

22mm 160mm 12.7mm

4)Inch sizes

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)130 degrees of carbide tip, can be resharpened after long time use

 6)R.P.M. Recommended
Hardened Steel & Iron      2000-4000RPM
   (Lubricant/Coolant keeps the bit sharper for a longer life)
Stainless Steel            2000-4000RPM
   (Lubricant required)
Glass Tile, Granite & Marble:  300-600RPM
    (Coolant improves cut and extends life of the bit)
Plastics and Laminates:        300-600RPM
7)Reuse of drill bits
You can resharpen your drill bits after long time use to save drill bits' life and your money
by using diamond sharpening wheel 
9)118 or 130 degrees of Tungsten Carbide Tipps are available for your choice