Drill Number            Decimal Inches          
 ** 78                      .0160
 ** 77                      .0180       Please Specify ALL SIZES for 
    76                      .0200       Drilling in .0000" (mil/thou).
 ** 75                      .0210
    74                      .0225       You may spec your drill data using
 ** 73                      .0240       these exact sizes or as finished
    72                      .0250       sizes (-.0030) from actual size.
 ** 71                      .0260
  * 70                      .0280       Which ever method you use please
    69                      .0292       indicate it in YOUR README file.
    68                      .0310
    67                      .0320                                         
    66                      .0330                                      
  * 65                      .0350                                         
    64                      .0360                                    
    63                      .0370
    62                      .0380
    61                      .0390
    60                      .0400
    59                      .0410
  * 58                      .0420
    57                      .0430
    56                      .0465
  * 55                      .0520
    54                      .0550
  * 53                      .0595
    52                      .0635
    51                      .0670
    50                      .0700
    49                      .0730
    48                      .0760
    47                      .0785
    46                      .0810
    45                      .0820
  * 44                      .0860
    43                      .0890
    42                      .0935
    41                      .0960
    40                      .0980
    39                      .0995
    38                      .1015
    37                      .1040
    36                      .1065
    35                      .1100
    34                      .1110
    33                      .1130
    32                      .1160
    31                      .1200
  * 1/8"                    .1250
    30                      .1285
    29                      .1360
    28                      .1405
    27                      .1440
    26                      .1470
    25                      .1495
  * 24                      .1520
    23                      .1540
    22                      .1570
    21                      .1590
    20                      .1610
    19                      .1660
    18                      .1695
    17                      .1730
    16                      .1770
    15                      .1800
    14                      .1820       
    13                      .1850
    12                      .1890
    11                      .1910
    10                      .1935
    09                      .1960
    08                      .1990
    07                      .2010
    06                      .2040
    05                      .2055
    04                      .2090
    03                      .2130
    02                      .2210
    01                      .2280


   ** = NOT AVAILABLE - FOR REFERENCE ONLY
   *  = STANDARD TOOLS FOR PROTO 1 SERVICE - NO CHARGE
      = OPTIONAL DRILLS AVAILABLE AT ADDITIONAL CHARGE ON PROTO 1

      NOTE PROTO 2 SERVICE ALLOWS FOR ANY 6 DRILLS BETWEEN .020 AND .228

      PROTO 2 - SIZES LARGER THAN .228 WILL BE ROUTED OUT AND WILL NOT BE 
      PLATED THROUGH.

      FINISHED HOLE SIZE WILL BE .003" SMALLER THAN THE ACTUAL DRILL SIZE



Here is a guide to assist you in the selection of your drills.
This is not intended to be taken as sage advice, simply put, it's
come from first hand experience.  Remember, while prototyping, give
yourself a bit of extra hole size - it makes it much easier to remove the
component (blue wire modifications)..etc.

.028" - via and some TO-92 packages
.035" - most IC packages
.042" - IDC headers, IC's, 1N4000 series diodes, TO-220's, 1/2W resistors
.052" - switches, stranded wire, molex headers
.060" - swithches, large headers & inter-connects
.086" - mounting holes in TO-220 packages, screw terminals
.125" - mounting holes
.152" - mounting holes

Note: the above sizes are unfinished diameters and are intended only as
      a guide line.