Busch® Twist Drills, Fig. 77

$2.39
6 - 66
72 - 138
144 +
  Priced per piece. Packaged 6 pieces per box, please order in multiples of 6.
Total ---
Made of tungsten vanadium steel with 3/32" shanks. Also available in a Set of 12 popular sizes, see "Related Products" below.

Individual sizes packaged 6 to a box. Please order in multiples of 6. Quantity pricing is for one item number only – not assorted.
It happens to everyone, a drill bit breaks and the business end is stuck inside the hole in your precious metal jewelry. If you can't reach it, how will you get it out? Place the ring into common Pickling Solution. The drill bit will dissolve in about 15 minutes.
B&S
Gauge
Millimeter
(mm)
Inch
(decimal)
Inch
(fraction)
1 7.348 0.289
2 6.543 0.258
6.350 0.250 1/4
5.953 0.234 15/64
3 5.827 0.229
5.556 0.219 7/32
4 5.189 0.204
5.154 0.203 13/64
4.762 0.188 3/16
5 4.621 0.182
4.366 0.172 11/64
6 4.115 0.162
3.969 0.156 5/32
7 3.664 0.144
3.572 0.141 9/64
8 3.263 0.128
3.175 0.125 1/8
9 2.906 0.114
2.778 0.109 7/64
10 2.588 0.102
2.381 0.094 3/32
11 2.304 0.091
12 2.052 0.081
1.984 0.078 5/64
13 1.828 0.072
14 1.628 0.064
1.588 0.063 1/16
15 1.449 0.057
16 1.291 0.051
1.191 0.047 3/64
17 1.149 0.045
18 1.024 0.040
19 0.912 0.036
20 0.812 0.032
0.795 0.031 1/32
21 0.723 0.028
22 0.644 0.025
23 0.573 0.023
24 0.511 0.020
25 0.455 0.018
26 0.405 0.016
0.396 0.015 1/64
27 0.360 0.014
28 0.321 0.013
29 0.286 0.011
30 0.255 0.010
31 0.227 0.0089
32 0.202 0.0080
33 0.180 0.0071
34 0.160 0.0063
35 0.142 0.0056
36 0.127 0.0050
37 0.113 0.0045
38 0.101 0.0040
39 0.090 0.0035
40 0.080 0.0031
B&S
Gauge
Millimeter
(mm)
Inch
(decimal)
Inch
(fraction)

Diameter
(mm)
Diameter
(inches)
0.50 0.0197
0.60 0.0236
0.70 0.0276
0.80 0.0315
0.90 0.0354
1.00 0.0393
1.10 0.0433
1.20 0.0472
1.30 0.0512
1.40 0.0551
1.50 0.0591
1.60 0.0630
1.70 0.0669
1.80 0.0709
1.90 0.0748
2.10 0.0827
2.20 0.0866
2.30 0.0906
  • 253