Think & Tinker, Ltd.
CNC router bits and carbide cutting tools with tutorials and technical guides
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PreciseBits offers bits in the following diameter sizes

PreciseBits Conversion Chart

Drill
Number
Fractional
Inches
Decimal
Inches
mm
 
 
0.0050
0.13
97
 
0.0060
0.15
94
 
0.0070
0.18
89
 
0.0090
0.23
87
 
0.0100
0.25
83
 
0.0120
0.30
81
 
0.0130
0.33
 
 
0.0150
0.38
 
1/64
0.0156
0.40
78
 
0.0160
0.41
 
 
0.0170
0.43
77
 
0.0180
0.46
76
 
0.0200
0.51
72
 
0.0250
0.64
71
 
0.0260
0.66
68
 
0.0310
0.79
 
1/32
0.0313
0.80
65
 
0.0350
0.89
  
Drill
Number
Fractional
Inches
Decimal
Inches
mm
65
 
0.0350
0.89
62
 
0.0380
0.97
 
 
0.0394
1.00
60
 
0.0400
1.02
 
3/64
0.0469
1.19
 
 
0.0480
1.22
 
 
0.0500
1.27
 
 
0.0530
1.35
 
1/16
0.0625
1.59
52
 
0.0630
1.60
 
 
0.0787
2.00
 
3/32
0.0938
2.38
 
 
0.1181
3.00
 
1/8
0.1250
3.18
 
5/32
0.1562
3.97
22
 
0.1570
3.99
 
3/16
0.1875
4.76
 
1/4
0.2500
6.35