.................
..........

//



//



//




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