High-quality twist drills from Dormer have straight shanks and are accurately ground then carefully tempered. They are the highest-quality jeweler's drills available.
These drills have a standard spiral flute design and straight shank with a 118° conical point, high-speed-steel with a bright uncoated finish for 4xD right-hand rotation drilling without pecking in metals. Suitable for a wide variety of materials including gold, silver, low and medium carbon steel, cast iron, wood, plastics, and resins. Individual size drills are available in 10-piece packs, or jump-start your selection with a 20-piece drill set including A100 wire gauge drills in sizes #61-#80 packaged in a convenient Dial-A-Tool plastic case with slide cover that allows access to only the size you need while keeping all others securely in their place.
Euro Twist drills are also available as a lower-cost option, and drills with 3/32" shank are available for use with your rotary tool handpiece in a drill press stand.
| Drill # | Diameter - IN | Diameter - MM | Drill # | Diameter - IN | Diameter - MM |
|---|---|---|---|---|---|
| 30 | 0.1285 | 3.264 | 56 | 0.0465 | 1.181 |
| 31 | 0.1200 | 3.048 | 57 | 0.0430 | 1.092 |
| 32 | 0.1160 | 2.946 | 58 | 0.0420 | 1.067 |
| 33 | 0.1130 | 2.870 | 59 | 0.0410 | 1.041 |
| 34 | 0.1110 | 2.819 | 60 | 0.0400 | 1.016 |
| 35 | 0.1100 | 2.794 | 61 | 0.0390 | 0.990 |
| 36 | 0.1065 | 2.705 | 62 | 0.0380 | 0.965 |
| 37 | 0.1040 | 2.642 | 63 | 0.0370 | 0.940 |
| 38 | 0.1015 | 2.578 | 64 | 0.0360 | 0.914 |
| 39 | 0.0995 | 2.528 | 65 | 0.0350 | 0.889 |
| 40 | 0.0980 | 2.489 | 66 | 0.0330 | 0.838 |
| 41 | 0.0960 | 4.438 | 67 | 0.0320 | 0.813 |
| 42 | 0.0935 | 2.378 | 68 | 0.310 | 0.787 |
| 43 | 0.0890 | 2.261 | 69 | 0.0292 | 0.734 |
| 44 | 0.0860 | 2.184 | 70 | 0.0280 | 0.712 |
| 45 | 0.0820 | 2.083 | 71 | 0.0260 | 0.660 |
| 46 | 0.0810 | 2.057 | 72 | 0.0250 | 0.635 |
| 47 | 0.0785 | 1.944 | 73 | 0.0240 | 0.610 |
| 48 | 0.0760 | 1.930 | 74 | 0.0225 | 0.572 |
| 49 | 0.0730 | 1.854 | 75 | 0.0210 | 0.533 |
| 50 | 0.0700 | 1.778 | 76 | 0.0200 | 0.508 |
| 51 | 0.0670 | 1.702 | 77 | 0.0180 | 0.457 |
| 52 | 0.0635 | 1.613 | 78 | 0.0160 | 0.406 |
| 53 | 0.0595 | 1.512 | 79 | 0.0145 | 0.369 |
| 54 | 0.0550 | 1.397 | 80 | 0.0135 | 0.343 |
| 55 | 0.0520 | 1.321 |