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| Type |
Wing |
Bit
Gauge |
Applicable
Casing pipe |
Guide
Bit |
Hammer
Tupe |
Extended
D1(mm) |
Retracted
(mm) |
Max.
O.D.
D2(mm) |
Min.
I.D.
D3(mm) |
Normal
Size
(In.) |
O.D.
D4(mm) |
315 |
4 |
373 |
318 |
355.6 |
336.6 |
14" |
320 |
SD12,
DHD112, N120, K270 |
365 |
4 |
425 |
363 |
406.4 |
387.4 |
16" |
365 |
SD12,
DHD112, N120, K320 |
410 |
4 |
478 |
412 |
457.2 |
435.0 |
18" |
414 |
SD15,
K350 |
460 |
4 |
530 |
461 |
508.0 |
482.6 |
20" |
463 |
SD15, K370,
SD18, N180 |
510 |
4 |
580 |
509 |
558.8 |
533.4 |
22" |
511 |
SD18, N180 |
560 |
4 |
630 |
559 |
609.6 |
584.2 |
24" |
561 |
SD18, N180,
K470 |
600 |
4 |
685 |
600 |
660.4 |
631.8 |
26" |
603 |
K520, N240 |
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