Concentric Casing System Type2

Model	Casing pipe (mm)		Max. O.D. of solitary ring bit (mm)	Casing shoe (mm)		Pilot Bit(mm)		Match DTH Hammer
	O.D.	Wall Thickness		O.D.	I.D.	Max.	through casing shoe O.D.
	O.D.	Wall Thickness		O.D.	I.D.	O.D.	through casing shoe O.D.
219	219	6.3-8	235	202	178	202	177	DHD360 API 3 1/2 REG	DHD380 API 4 1/2 REG
219	219	10.0-12	235	194	178	194	177	DHD360 API 3 1/2 REG	DHD380 API 4 1/2 REG
273	273	6.3-8	292	256	227	256	226	DHD380 API 4 1/2 REG
		10.0-12		248	227	248	226
		14-16		240	227	240	226
323	323	10.0-12	341	298	276	298	275	SD10 API 6 5/8 REG
		12.5-14		294	276	294	275
		16mm		290	276	290	275
351	351	10.0-12	371	326	297	326	296	SD10 API 6 5/8 REG
		12.5-14		322	297	322	296
		16mm		318	297	318	296
377	377	10.0-12	397	352	323	352	350	SD10 API 6 5/8 REG
		12.5-14		348	323	348	346
		16mm		344	323	344	342
406	406	10-12.5	421	380	354	380	378	N120(N125) API 6 5/8 REG
406	406	14-16	421	373	354	373	371	N120(N125) API 6 5/8 REG